Magellanic Diving Petrel

Is a small, stocky, and penguin-like seabird measuring approximately 7.5 to 8.3 inches (19 to 21 centimeters) in length, with a wingspan of about 12 to 14 inches (30 to 35 centimeters) and an average weight ranging from 4.2 to 5.3 ounces (120 to 150 grams). Its streamlined body features highly specialized, short, and powerful wings adapted for underwater propulsion. The upperparts are a deep, glossy blue-black, which contrasts sharply with the pure snow-white underparts. A key diagnostic feature is the conspicuous white collar-like crescent on each side of the neck, curving upwards behind the ear coverts and contrasting with the dark crown and greyish face. The bill is short, stout, and black, featuring distinct tubular nostrils fused on the culmen. Its legs and webbed feet display a pale bluish-grey coloration.

Geographical distribution: Occurs in the subantarctic and cold-temperate waters of southern South America. Its breeding range spans the extensive network of channels and fjords of southern Chile, extending from the Los Lagos region south to Cape Horn, as well as the coastal waters of Patagonian Argentina north to the San Jorge Gulf. It is also widely distributed throughout the Falkland Islands (Islas Malvinas), and during the non-breeding season, individuals disperse northward along the cold waters of the Humboldt Current in the Pacific and the Malvinas Current in the Atlantic.

Habitat: Inhabits primarily sheltered coastal marine systems, including fjords, deep channels, protected bays, and sounds near forested shorelines, largely avoiding offshore pelagic waters during the breeding season. However, during the winter months, it can be found across the wider continental shelf, utilizing cold, highly productive oceanic currents rich in zooplankton.

Feeding: Sustains itself on a strictly carnivorous marine diet. It feeds predominantly on small planktonic crustaceans, showing a high preference for krill, copepods, and amphipods, but also consumes small pelagic fish and larval cephalopods. It captures its prey via pursuit-diving, using its short wings to fly underwater with remarkable speed and agility at average depths of 30 to 60 feet (10 to 20 meters), although it is capable of deeper dives.

Behavior: Exhibits a characteristic flight style consisting of rapid, whirring wingbeats close to the water´s surface, often flying straight through the crests of waves rather than over them. It is highly gregarious around its breeding grounds but remains solitary or occurs in small groups at sea. To minimize predation by avian predators such as skuas (Stercorarius spp.) and large gulls, it exhibits strictly nocturnal behaviors when visiting its terrestrial breeding colonies.

Nesting: Commences its breeding season between October and December. It breeds in dense colonies located on offshore islands and rocky islets free of terrestrial predators. It constructs its nests by digging burrows measuring up to 5 feet (1.5 meters) in length in steep slopes with soft soil, peat, or under thick mats of tussock grass (Poa flabellata). The female lays a single white egg, which is incubated by both parents in alternating shifts for approximately 45 to 53 days. The altricial chick is brooded and fed regurgitated food by both adults until it fledges at the end of the austral summer.

Conservation status: Is currently evaluated as Least Concern (LC) by the International Union for Conservation of Nature (IUCN) Red List. Despite having a robust population estimated at several tens of thousands of individuals, its terrestrial breeding sites are highly vulnerable to introduced invasive mammals such as American minks, rats, and feral cats, which prey heavily on eggs and chicks. Additional threats include marine pollution from oil spills and accidental drowning in gillnets.