Fuegian Steamer Duck

Fuegian Steamer Duck
Conservation status
Least Concern (IUCN 3.1)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Anseriformes
Family:	Anatidae
Genus:	Tachyeres
Species:	T. pteneres
Binomial name
Tachyeres pteneres (Forster, 1844)

The Fuegian Steamer Duck (Tachyeres pteneres), also called the Magellanic Flightless Steamer Duck, is a flightless duck from South America. It belongs to the steamer duck genus Tachyeres. It inhabits the rocky coasts and coastal islands from southern Chile and Chiloé to Tierra del Fuego, switching to the adjacent sheltered bays and lakes further inland when breeding.

Description

It is a massively built waterfowl at 3.5–7 kg (7.7–15 lb) and 65–84 cm (26–33 in), with the males noticeably larger than the females.^[1] The wingspan is 85–110 cm (33–43 in). This species outweighs any other wild species called "duck", although this species is only distantly related to most true ducks (for example of the genus Anas). On males, the head and neck is blue-gray, with paler coloration crown and forehead. He has a narrow white eye-ring which continuing backwards as stripe and a reddish-brown throat. His abdomen, ventral area and undertail coverts are white and the tail is grey. Females are a darker gray-brown on the head and dark reddish on the throat. Her body and wings as males, but she may have brown/wine colouring on feathers. The juvenile is similar to the female but slightly duller colored.

Life History

This species either nests near water obscured in dense, shrubby vegetation or in abandoned penguin nest burrows in September through December. 4-11 eggs are laid, with an average clutch of 9. The ivory eggs measure 8.2 × 5.6 cm (3.2 × 2.2 in) and weigh around 167 g (5.9 oz). Incubation occurs for 28 to 40 days. The young fledge at 120-130 days and are driven from the parent's terrority by their parents and form flocks with other ousted immature steamerducks. They become sexual mature at 2 to 3 years of age. Adult males are known to be extremely aggressive during mating season, including towards other waterfowl, but may join mixed-species winter flocks without incident.

There are several potential predators of eggs and young birds: foxes, caracaras, gulls, skuas and giant petrels. Healthy adults may have no natural predators. This species lives principally off of saltwater molluscs, crustaceans and small fish. During the breeding season, they tend to eat and feed their young small snails, insect larvae, amphipods and isopods/

This species is locally infamous for the aggressive disposition of adult males. Incidents have allegedly occurred where a raging male was placed by a misguided collector among adults of various other waterfowl species and killed all the other birds with their powerful, spurred wings.^[2]

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  A pair near Chiloé in Chile.

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  An individual demonstrating its short wings on Chiloé island, Chile.

References

1. ^ http://whozoo.org/Intro2003/JuanAlviar/JA_Steamer.htm
2. ^ [1]

• BirdLife International (2004). Tachyeres pteneres. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 11 May 2006. Database entry includes justification for why this species is of least concern

• "Tachyeres pteneres". Wild Pro. http://wildpro.twycrosszoo.org/S/0AvAnserif/anatidae/1ACrAvAn_tachyeres/Tachyeres_pteneres/Tachyeres_pteneres.htm. Retrieved 14 October 2011.