Wilson’s Storm petrel

Wilson’s Storm-petrel (Oceanites oceanicus) is one of the most abundant wild bird species on Earth. For pelagic birdwatchers and wildlife enthusiasts based in the United States, this small, dark seabird represents a major migratory link between the icy coastlines of Antarctica and the offshore waters of the North Atlantic. Despite its delicate appearance, it holds the distinction of being the smallest warm-blooded animal that breeds in the cold Antarctic region. During the northern hemisphere summer, it travels thousands of miles north, often appearing in massive flocks over the continental shelf of the eastern United States. Understanding the biology of this bird requires a precise look at its physical measurements, complex taxonomic classification, specific foraging mechanisms, and long-distance migratory patterns.

The physical blueprint of Wilson’s Storm-petrel is highly specialized for continuous flight over open ocean water. It is a small seabird with an average total length of 150 to 190 millimeters, a wingspan ranging from 380 to 420 millimeters, and a body mass that fluctuates between 30 and 45 grams. Its plumage is predominantly a uniform sooty blackish-brown. This dark coloration creates a sharp contrast with a broad, bright white band across its rump and upper tail coverts. This white patch is often highly visible even at long distances across the water.

A pale brown or greyish band runs diagonally across the upper wing coverts, formed by the lighter edges of the greater wing covert feathers. The underwing is completely dark except for a subtle, variable greyish-white central lining. The bill is short, black, and hooked at the tip, featuring prominent external nasal tubes running along the top of the upper mandible.

For birdwatchers operating off the Atlantic or Pacific coasts of the USA, separating Wilson’s Storm-petrel from other common lookalikes requires careful observation of structural proportions and flight mechanics. Its tail is short and square-tipped, completely lacking the deep forks or notches seen in other species. Its legs are exceptionally long relative to its body size. The tarsus length measures between 32 and 37 millimeters, which causes the entire foot assembly to project 10 to 15 millimeters beyond the tip of the tail when the bird is in level, straight-line flight. The toes feature completely black digits connected by webbed skin that is bright yellow in the center. While this yellow webbing is a definitive diagnostic marker, it is rarely visible unless the bird is observed at close range or captured during photographic analysis.

Morphological and Structural Comparison of Common North American Storm-Petrels

Physical Characteristic	Wilson’s Storm-petrel (Oceanites oceanicus)	Leach’s Storm-petrel (Hydrobates leucorhous)	Band-rumped Storm-petrel (Hydrobates castro)	European Storm-petrel (Hydrobates pelagicus)
Total Length	150 to 190 mm	190 to 220 mm	190 to 210 mm	140 to 160 mm
Wingspan	380 to 420 mm	450 to 480 mm	430 to 460 mm	360 to 390 mm
Body Mass Range	30 to 45 g	40 to 50 g	40 to 52 g	22 to 30 g
Tail Structure	Flat, square-tipped	Deeply forked	Slightly notched	Completely square
Foot Projection	Extends 10 to 15 mm past tail	Does not extend past tail	Does not extend past tail	Does not extend past tail
Toe Webbing Color	Yellow centers with dark borders	Solid brownish-black	Solid dark black	Solid dark black
Flight Style	Fluttering, continuous deep wingbeats	Erratic, bounding, nighthawk-like	Steady, shearing, lower to water	Direct, bat-like, fast wingbeats

Taxonomy

The taxonomic history of Wilson’s Storm-petrel reflects shifts in our understanding of seabird evolution. The species was first formally described by German naturalist Heinrich Kuhl in 1820 under the binomial name Procellaria oceanica. It was later moved to the genus Oceanites, which was established by the English ornithologist and artist John Gould. The common name commemorates the Scottish-American ornithologist Alexander Wilson, who is widely regarded as the father of American ornithology.

Historically, all storm-petrels were classified within a single, broad family called Hydrobatidae. However, modern genetic testing, DNA-DNA hybridization, and osteological (bone structure) comparisons have proven that storm-petrels are split into two distinct lineages. Today, Wilson’s Storm-petrel belongs to the family Oceanitidae, commonly known as the southern storm-petrels. This family is evolutionarily separate from the northern storm-petrels (Hydrobatidae) and is characterized by distinct pelvic bone structures and elongated tarsal elements.

Taxonomic Hierarchy of Oceanites oceanicus

Taxonomic Rank	Scientific Name	Diagnostic Biological Feature
Kingdom	Animalia	Multicellular, heterotrophic organisms
Phylum	Chordata	Organisms possessing a dorsal nerve cord and internal skeletal support
Class	Aves	Endothermic, feathered vertebrates capable of amniotic egg production
Order	Procellariiformes	Tubenoses; highly advanced olfactory anatomy and specialized salt glands
Family	Oceanitidae	Southern storm-petrels; distinct skeletal structure, long legs, flat tarsi
Genus	Oceanites	Elongated legs, short square or rounded tails, southern hemisphere breeding centers
Species	Oceanites oceanicus	Globally migratory form featuring yellow-centered toe webbing

There are three widely accepted subspecies of Wilson’s Storm-petrel, which are distinguished primarily by their geographic breeding ranges and minor variations in body size and bill dimensions. A fourth historical population from New Zealand, described as Oceanites oceanicus maorianus, is now widely considered extinct or a distinct species based on limited museum specimens.

Subspecies Metrics and Breeding Ranges

Subspecies Name	Primary Geographic Breeding Range	Distinct Structural Features	Target Wing Length Parameters
O. o. oceanicus	Sub-Antarctic islands (South Georgia, Kerguelen, Crozet, Falklands)	Nominate form; intermediate physical dimensions	Wing length ranges from 142 to 152 mm
O. o. exasperatus	Antarctic mainland coast, South Shetland Islands, South Orkney Islands	Significantly larger body size, heavier bill, and longer wings	Wing length ranges from 153 to 163 mm
O. o. chilensis	Tierra del Fuego, Cape Horn archipelago, southern Chilean fjords	Smallest overall body mass; frequent white mottling on lower belly	Wing length ranges from 135 to 144 mm

Distribution

The distribution of Wilson’s Storm-petrel is completely global, spanning multiple ocean basins across both hemispheres throughout the year. During the austral summer (December to April), its distribution is circumpolar across the Southern Ocean. Its breeding colonies are built on rugged, ice-free islands and coastal cliffs located within the sub-Antarctic and Antarctic zones.

Once the breeding season wraps up in late April, the species initiates a massive trans-equatorial migration. The birds move northward away from advancing winter pack ice, dispersing across the Atlantic, Pacific, and Indian Oceans. The species is far more abundant in the Atlantic Ocean than in the Pacific.

In the North Atlantic, their distribution follows the warm waters of the Gulf Stream. By May and June, millions of individuals arrive off the eastern coast of North America, stretching from the Florida Keys up through the mid-Atlantic states, New England, and into the grand banks of Newfoundland, Canada. A separate migration route carries large populations into the northern Indian Ocean, where they concentrate within the highly productive upwelling zones of the Arabian Sea and the Gulf of Oman. In the Pacific Ocean, their presence is much sparser, concentrated primarily along western South America and occasionally reaching into the waters off California and the Central Pacific.

Range and Population

Quantifying the exact global population of Wilson’s Storm-petrel is challenging for field biologists. These birds nest in deep, hidden rock crevices, operate strictly under the cover of total darkness when on land, and are spread across remote, uninhabited polar islands. Historical estimates from the late 20th century suggested a population exceeding 50 million breeding pairs, though modern, systematic survey data has revised those figures downwards. The current consensus among international conservation databases places the global population between 8 million and 20 million mature individuals. Despite this downward revision in data, it remains one of the most populous seabirds in the world.

The overall global population trend is currently evaluated as stable. However, localized long-term monitoring operations have recorded severe regional fluctuations. For example, a 42-year population dynamics study conducted at King George Island in Antarctica from 1978 to 2020 documented a catastrophic 90% decline in two specific monitored breeding colonies. This localized drop was directly linked to shifting environmental variables, including increased regional snow accumulation that blocked nesting cavities and altered the local abundance of marine prey.

Estimated Breeding Pair Densities Across Major Global Sectors

Geographic Sector	Specific Breeding Localities	Estimated Population (Breeding Pairs)	Documented Local Trend
South Atlantic Ocean	South Georgia, South Sandwich Islands, Falkland Islands	1,000,000 to 2,500,000 pairs	Stable to increasing post-rodent eradication
Maritime Antarctic	South Shetland Islands, South Orkney Islands, Palmer Archipelago	500,000 to 1,200,000 pairs	Highly variable; localized declines up to 90%
Antarctic Continent	Adelie Land, Queen Maud Land, coastal nunataks	200,000 to 600,000 pairs	Stable; limited by summer ice melt speed
South Indian Ocean	Kerguelen Islands, Crozet Islands, Heard Island	1,500,000 to 3,000,000 pairs	Stable in high-altitude interior rocky zones
South Pacific Ocean	Tierra del Fuego, Cape Horn archipelago	500,000 to 1,000,000 pairs	Data deficient; assumed stable

Habitat

The life cycle of Wilson’s Storm-petrel is divided into two distinct habitats: the open pelagic zones of the world’s oceans and the rugged terrestrial micro-habitats of isolated polar islands. Outside of the 4-month breeding season, this bird is entirely pelagic. It spends 100% of its time at sea, never making landfall. It shows a strong preference for deep, offshore waters beyond the continental shelf break. It frequently aggregates around marine upwellings, cold-front boundaries, and regions where melting sea ice creates nutrient-rich surface layers that drive high plankton production.

When returning to land to reproduce, the bird’s structural requirements for its habitat become narrow. It targets completely ice-free, barren, or low-vegetation areas on sub-Antarctic and maritime Antarctic islands. The birds utilize specific physical substrates for nesting:

• Rocky Scree and Talus Slopes: Open fields of loose, fragmented volcanic or glacial rock where natural spaces form between the stones.

• Boulder Fields: Dense collections of large rocks where deep, protective crevices guard against wind and freezing temperatures.

• Soft Peat and Moss Turf: Areas where organic soils are thick enough to allow the birds to excavate shallow, underground burrows using their bills and feet.

Nesting sites range from sea level up to several hundred meters inland on high mountain ridges and nunataks (exposed rock ridges surrounded by ice), provided the micro-site stays clear of solid ice during the summer months.

Behavior

The behavioral patterns of Wilson’s Storm-petrel are shaped by the dual pressures of finding patchily distributed food over vast ocean distances and avoiding intense predation on land. At sea, the species is highly gregarious, frequently forming loose foraging flocks that can number from several dozen to many thousands of individuals, particularly at major migratory staging points or in the wake of sea-ice melts.

The flight behavior of Oceanites oceanicus is highly distinctive and serves as an important field identification tool. The bird flies low over the water, using a series of quick, shallow wingbeats interspersed with short glides. When foraging, it drops its long legs down so its webbed feet make contact with the ocean surface. It then uses a continuous “pattering” or “bounding” motion, appearing to walk or skip across the water while holding its wings open and steady above its body. This pattering behavior serves a dual purpose: it stabilizes the bird against shifting winds just inches above the wave crests and disturbs small surface-dwelling organisms, making them easier to capture.

On land, the bird’s behavior shifts completely due to its vulnerability to visual predators like Brown Skuas (Catharacta antarctica) and Kelp Gulls (Larus dominicanus). Wilson’s Storm-petrel is strictly nocturnal on its breeding grounds. Adults will only approach or depart from their nesting sites under total darkness. They usually arrive at the colony 1 to 2 hours after sunset and clear the area entirely before dawn. On clear nights with bright, full moons, activity at the colony drops off dramatically as the birds stay out at sea to avoid being targeted by predators.

Because of their leg anatomy, their walking ability on solid ground is extremely limited. The legs are designed to absorb wave impacts at sea rather than support their weight on land. On the rare occasions they move across flat rock, they execute a clumsy, forward-shuffling motion, often using their breast and hooked bill to steady themselves as they crawl toward their nesting cavities.

Feeding

Wilson’s Storm-petrel functions as a specialized surface-seizer within marine food webs. Stable isotope analysis ($\delta^{13}\text{C}$ and $\delta^{15}\text{N}$) conducted on feather and egg albumen samples indicates that the species occupies a distinct trophic position that changes seasonally based on regional prey availability.

During the summer breeding season in the Southern Ocean, the diet relies heavily on macro-zooplankton, with a strong focus on crustaceans. The primary target is Antarctic Krill (Euphausia superba), alongside hyperiid amphipods. However, during the chick-rearing phase and the post-breeding northern migration, the diet shifts toward small mesopelagic fish, specifically lanternfish (family Myctophidae). This shift provides a major boost in lipid and caloric intake, helping satisfy the high energy demands of growing chicks and long-distance travel.

The birds capture food by hovering directly over the water surface, pattering their feet, and lowering their bills into the upper few centimeters of the water film to snatch individual prey items. They do not plunge-dive or swim beneath the surface. They are also enthusiastic ship-followers, regularly trailing research vessels, fishing trawlers, and marine mammals to scavenge oil, offal, and small organisms brought to the surface by the wake.

Quantitative Dietary Composition Based on South Georgia Colony Regurgitation Samples

Prey Classification	Dominant Representative Species	Total Percentage by Mass (%)	Sample Frequency of Occurrence (%)
Planktonic Crustaceans	Euphausia superba (Antarctic Krill)	55%	78%
Hyperiid Amphipods	Themisto gaudichaudii	13%	90%
Mesopelagic Fish	Myctophidae (Protomyctophum bolini, P. normani)	28%	41%
Small Cephalopods	Brachioteuthis spp. (juvenile squid)	3%	2%
Marine Insects & Refuse	Halobates spp., organic offal, surface lipids	1%	5%

Breeding

The reproductive strategy of Wilson’s Storm-petrel is built on a slow lifecycle: low reproductive output balanced by high parental investment. The species has a monogamous mating system, and pairs display high site and mate fidelity, returning to the exact same rock crevice year after year.

The breeding cycle begins in late November to early December when adults arrive back at their polar colonies. Courtship occurs deep within the nesting cavities at night, consisting of mutual preening and a series of high-pitched, chattering vocalizations.

The female lays a single, relatively massive egg between mid-December and early January. The egg is dull white, often marked with a faint ring of fine reddish-brown speckles on the larger end. Producing this egg requires a huge nutritional investment from the female; the egg typically weighs between 7 and 9 grams, which represents 20% to 25% of her total body mass. Immediately after laying the egg, the exhausted female leaves the nest for a “pre-laying exodus.” She spends several days feeding out at sea to rebuild her energy reserves while the male takes the initial incubation shift.

Incubation is shared equally by both parents and lasts between 39 and 48 days. The parents take alternating shifts that last 48 to 72 hours, allowing the off-duty partner to fly hundreds of miles out over the open ocean to forage.

Chronological Matrix of the Annual Reproductive Cycle

Breeding Lifecycle Phase	Active Calendar Period	Phase Duration Range	Primary Parental Behavior & Investment
Colony Arrival	Late Nov to early Dec	10 to 15 days	Re-clearing snow from rock cavities; nocturnal courtship
Pre-Laying Exodus	Mid-December	5 to 9 days	Females forage intensively at sea; males maintain burrow ownership
Egg Laying	Late Dec to early Jan	1 day	Deposition of a single egg representing ~22% of female body mass
Incubation Period	Jan to mid-Feb	39 to 48 days	Alternate parental incubation shifts lasting 48 to 72 hours
Hatching & Brooding	Mid-February	1 to 2 days	Constant brooding until chick develops independent thermoregulation
Chick Rearing Phase	Late Feb to mid-April	52 to 60 days	Nightly provisioning with high-density stomach oil and digested krill
Fledging & Dispersal	Late April to early May	1 to 3 days	Chick leaves burrow independently under zero-lux conditions

Once the chick hatches, it is semi-precocial and covered in dense, dark grey down. The parents brood it continuously for only 24 to 48 hours until it can regulate its own body temperature. After that, the chick is left completely alone in the dark nesting cavity during daylight hours while both parents forage simultaneously at sea.

The parents return to the nest exclusively at night to deliver highly concentrated, lipid-dense stomach oil and partially digested krill via regurgitation. The average meal size delivered to the chick ranges from 6.5 to 7.5 grams, which can represent up to 22% of an adult’s total body mass. The chick rearing phase lasts 52 to 60 days. Growth rates can vary significantly depending on the weather; if unseasonal blizzards block the burrow entrance with snow, the chick can enter a state of torpor (lowered metabolic rate and body temperature) to survive for several days without food until its parents dig out the opening. Fledging occurs in late April or early May, and the young bird flies out to sea to begin its life independently.

Comparative Analysis of Egg-to-Body Mass Ratios Across Seabird Clades

Bird Species	Mean Adult Body Mass (g)	Mean Egg Mass (g)	Relative Mass Ratio (% of Adult Mass)
Wilson’s Storm-petrel	40 g	8.5 g	21.25%
Leach’s Storm-petrel	45 g	10.0 g	22.22%
European Storm-petrel	26 g	5.8 g	22.30%
Short-tailed Shearwater	550 g	85.0 g	15.45%
Wandering Albatross	9,000 g	430.0 g	4.77%

Threats

The threats facing Wilson’s Storm-petrel are divided between natural weather risks at their polar nesting grounds and human-caused hazards across the global oceans.

On land, weather anomalies are a major driver of mortality. Severe, unseasonal summer snowstorms can dump heavy snow that blocks the narrow entrances to rocky nesting crevices. If the snow doesn’t melt quickly, it can trap the adults or chicks inside, leading to widespread starvation or egg loss.

Introduced mammalian predators represent another threat, particularly on sub-Antarctic islands. Feral cats (Felis catus), house mice (Mus musculus), and various rat species (Rattus spp.) have caused major damage to localized colonies. Because these storm-petrels evolved on isolated islands without native land mammals, they lack defensive behaviors; rats and mice can easily enter nesting cavities to eat eggs and defenseless chicks.

At sea, the primary threats are linked to human activity. Because they are surface-feeders, Wilson’s Storm-petrels frequently ingest floating micro-plastics, mistaking them for fish eggs or small crustaceans. Long-term stomach analysis surveys in the western North Atlantic have revealed that between 40% and 60% of sampled individuals contain plastic fragments in their digestive tracts, which can cause internal injuries or toxic chemical buildup over time.

Additionally, because they travel and forage at night, these birds are highly susceptible to light attraction. They can collide with offshore oil platforms, natural gas flares, and large commercial fishing vessels during foggy nocturnal migrations, often resulting in fatal impacts.

Quantified Impact of Terrestrial and Pelagic Mortality Drivers

Threat Classification	Environmental Context / Driver	Documented Localized Impact Rate	Primary Age Class Affected
Climatic Entombment	Severe unseasonal polar blizzards and packed drift-snow	15% to 40% localized mortality	Eggs and unthermoregulated chicks
Invasive Mammals	Introduction of Rattus rattus and Felis catus	Up to 85% localized colony failure	Nesting adults, eggs, and chicks
Micro-plastic Ingestion	Macro-plastic breakdown in northern foraging zones	40% to 60% of sampled individuals	Ocean-foraging adults and fledglings
Infrastructure Strike	Offshore drilling flares and high-intensity maritime lighting	Variable; spikes during foggy conditions	Nocturnally migrating sub-adults and adults

Migration

The annual migration of Wilson’s Storm-petrel is an extraordinary endurance feat, covering a round-trip loop that often exceeds 30,000 to 40,000 kilometers. Once the breeding season wraps up in late April, populations quickly abandon their Southern Ocean colonies and head north along specific pelagic flyways.

The primary migration route moves up the Atlantic Ocean. The birds track the western edge of the Atlantic, utilizing prevailing wind patterns and the warm, nutrient-rich currents of the Gulf Stream. By mid-to-late May, the vanguard of the migration reaches the offshore waters of the eastern United States. Throughout June, July, and August, millions of Wilson’s Storm-petrels occupy the waters off New England, New York, and the Mid-Atlantic states. During this northern stay, the birds undergo their primary flight feather moult, taking advantage of high summer zooplankton production over underwater features like Georges Bank and the Hudson Canyon.

A secondary flyway carries large populations into the northern Indian Ocean, where they spend the austral winter feeding in the upwelling zones of the Arabian Sea. A smaller population tracks up the Pacific Ocean, though sightings along the western US continental shelf remain relatively uncommon compared to the massive numbers seen in the Atlantic. By early September, the birds begin their return journey south, moving down broad oceanic corridors to arrive back at their Antarctic colonies in mid-November.

Primary Migratory Flyways and Latitudinal Milestones

Ocean Basin Flyway	Active Transit Window	Latitudinal Ranges Covered	Key Regional Foraging Concentrators
North Atlantic Route	May to August	40° N to 60° N	Georges Bank, Gulf Stream eddies, Hatteras Canyon
North Pacific Route	June to September	30° N to 50° N	California Current upwellings, Davidson Current
North Indian Route	May to September	10° S to 25° N	Arabian Sea upwelling formations, Gulf of Oman

Unique Adaptations

To survive indefinitely in the open ocean without ever returning to land for fresh water, Wilson’s Storm-petrel has evolved a suite of specialized physiological and structural adaptations.

Like all members of the order Procellariiformes, these birds possess advanced, internal salt-excreting glands. Located in shallow depressions in the skull directly above the eye sockets, these glands act as highly efficient secondary filters for the bird’s blood. They extract excess sodium chloride, concentrating it into a thick saline fluid that is then pumped out through the prominent external nasal tubes (naricorns) on the upper bill. This mechanism allows the bird to maintain a safe internal fluid balance while drinking raw seawater and consuming highly saline marine invertebrates.

In addition to their water filtration system, these birds have an exceptionally advanced sense of smell, driven by enlarged olfactory bulbs in the brain. They use this keen olfaction to navigate and locate food across thousands of square miles of featureless ocean. They are particularly attuned to the scent of dimethyl sulfide (DMS), a volatile chemical compound released by marine phytoplankton when they are grazed upon by zooplankton like krill. By flying across the wind and tracking these microscopic scent plumes, Wilson’s Storm-petrels can efficiently pinpoint localized patches of food from miles away.

Finally, their digestive tract features a highly specialized fore-stomach, or proventriculus, that can break down food into a concentrated, lipid-rich oil. This stomach oil has a low specific gravity and an extremely high caloric density. It serves as a lightweight, long-term energy reserve that adults can carry for days over immense distances without spoiling, allowing them to bring a highly concentrated meal back to their single chick on the remote breeding islands.

Structural and Physiological Adaptations of Oceanites oceanicus

Biological Adaptation	Anatomical Location	Primary Survival / Ecological Function
Supraorbital Glands	Frontal bone depressions above eyes	Filters out excess NaCl; allows long-term consumption of seawater
Naricorn Tubes	Dorsal ridge of upper mandible	Safely channels concentrated brine clear of eyes and feathers
Enlarged Olfactory Bulbs	Forebrain architecture	Detects Dimethyl Sulfide (DMS) plumes to locate distant krill
Proventricular Oil Synthesis	Fore-stomach lining	Converts prey into a lightweight, energy-dense oil for chick provisioning
Elongated Tarsi	Lower leg assembly	Absorbs wave impacts during surface-pattering behaviors
Dense Hydrophobic Contour Feathers	Exterior plumage wrap	Interlocking barbicels seal out freezing polar water

Conservation Efforts

While the global status of Wilson’s Storm-petrel is categorized as Least Concern by the International Union for Conservation of Nature (IUCN), protecting their populations requires active habitat management at critical breeding colonies. Because their primary threat on land comes from introduced predators, conservation agencies have focused their efforts on island-wide eradication programs.

Over the past twenty years, multi-million-dollar eradication campaigns have successfully cleared introduced rats and feral cats from major sub-Antarctic islands, including South Georgia and Campbell Island. Following the verified removal of these pests, field teams have documented a steady recovery and re-colonization of storm-petrel breeding colonies along accessible stone scree and soil banks.

In addition to island restoration, ongoing international conservation frameworks rely on strict biosecurity protocols. These measures are designed to prevent the re-introduction of rodents by scientific expeditions and eco-tourism vessels, ensuring that these isolated islands remain safe, predator-free sanctuaries for millions of nesting pelagic birds.

Cultural Significance

The cultural footprint of Wilson’s Storm-petrel is closely tied to maritime history and folklore. For centuries, sailors across the Atlantic and Southern Oceans referred to these birds—along with related storm-petrel species—as “Mother Carey’s Chickens.” This traditional name was a linguistic corruption of Mater Cara, or “Dear Mother,” a reference to the Virgin Mary, whom sailors looked to for protection during severe ocean storms.

In maritime folklore, the sudden appearance of Wilson’s Storm-petrels pattering along the water near a ship’s stern was viewed as a warning sign that a low-pressure system or severe storm was approaching. Sailors believed that the birds were the spirits of deceased mariners condemned to wander the open ocean indefinitely. As a result, harming or killing a storm-petrel was considered a profound taboo that would bring bad luck or catastrophic weather to the vessel, an early cultural taboo that provided the birds with a form of protection long before modern conservation laws were enacted.