ZINO’S PETREL Pterodroma madeira

Madeira Petrel, Freira
L 32–33 cm, WS 83–86 cm.

IDENTIFICATION

 One of only two Pterodroma (gadfly) petrels breeding in our region and much the rarer. Extremely similar to Fea’s Petrel (q.v.), with no consistent plumage differences yet determined. Differs in being about 10% smaller overall with significantly smaller head and more slender bill. Appears shorterand broader-winged, with stubbier body. Separation in the field may not be possible unless views are quite exceptional and, even then, direct comparison with feae would be desirable. In the hand the two can be separated on measurements: Zino’s: wing 247–254 mm, tail 104–110 mm, tarsus 30–31 mm, bill 24.5– 26.5 mm; Fea’s: wing 263–273 mm, tail 108–115 mm, tarsus 32–38 mm, bill 26–30 mm. VOICE Calls at breeding sites perhaps sharper and not quite so mournful as in Fea’s Petrel (q.v.). Sometimes gives a whimpering cry. Silent at sea.

TAXONOMY 

Until recently treated as a race of Softplumaged Petrel P. mollis. 

STATUS/HABITAT 

Extremely rare and endangered. (Also recorded from Azores, where it may even breed.) Breeds on cliffs and crags on the main island of the Madeira group only, often well inland. Pelagic, normally coming inshore only close to breeding sites.