Wilson's Storm-petrel Oceanites oceanicus (Kuhl, 1820)

Order: Procellariiformes Family: Hydrobatidae Status: Vagrant to Madeira

Wilson's Storm Petrel Oceanites oceanicus

Recommended birdwatching sea trips to watch this seabird

Zino’s Petrel Pelagic Expedition

Wilson's Storm Petrel Oceanites oceanicus

Wilson's Storm-petrel Field ID Keys

Shape & Size

Oceanites oceanicus is a small pelagic bird though a medium sized storm-petrel with long legs. It has a “relatively short arm, broad wings (...) and toes typically project noticeably beyond tail in flight” (Howell, 2012). Its tail is straight-ended even when fanned.

Colour Pattern

This is a black and white seabird with a pale gray upperwing bar, dark brownish-black underwings and a large white rump that extends to lateral undertail coverts.
It has yellow webbing between its toes, only visible at very close range

Behavior

In Madeira waters it is usually seen alone. Flies like a swallow with “long soaring-flights interspersed with short series of wing-beats” (Duivendijk, 2010).
It is normally attracted to chum where it can spend some hours foot-pattering and dancing with the waves to collect food, resembling White-faced storm-petrel feeding behaviour.

Habitat

Wilson’s storm-petrel is a pelagic bird that breed in the South Atlantic and visits all major oceans except the Arctic. Around Madeira Oceanites oceanicus is typically seen offshore.

Distinction from similar species

When compared to Hydrobates pelagicus, Oceanites oceanicus is bigger in size though it is smaller than Oceanodroma castro. The toes projected beyond the tail when flying is a good feature to distinguish from the other two species though sometimes it helds them drawn in.

Oceanites oceanicus Biometrics

Wingspan: 380 - 420 mm (Flood & Ashley, 2011)
Total length: 150 - 190 mm (Flood & Ashley, 2011)
Weight: 35 - 50 g (Flood & Ashley, 2011)

Other Bird Facts

Seasonality in Madeira: Seen from end of April to end of August
Breeding: From December to May in the South Atlantic
Diet: Its diet consists mainly on planktonic crustaceans, especially krill, and small fish

Status

Madeira local status by Romano et al, 2010: Seasonal vagrant
Madeira local status by Zino et al, 1995: Exceptional vagrant
Conservation status by the IUCN Red List Categories, 2013: Least Concern ver 3.1

Name of this species in other languages

Portuguese: Painho de Wilson, Alma-de-mestre
German: Buntfuß-Sturmschwalbe
Dutch: Wilsons Stormvogeltje
Swedish: Havslöpare
Danish: Wilsons Stormsvale
Finish: Etelänkeiju
Norwegian: Wilsonstormsvale
Spanish: Paíño de Wilson
French: Océanite de Wilson
Italian: Uccello delle tempeste di Wilson
Polish: Oceannik żółtopłetwy
Slovak: Búrkozvest Pestronohý
Czech: Buřňáček Wilsonův

Join Madeira Wildlife Monthly Newsletter. All the updates on your email every month.