Family Petrels, Shearwaters (Procellariidae)


Bermuda Petrel (Pterodroma cahow)


French: Pétrel des Bermudes German: Bermudasturmvogel Spanish: Petrel cahow
Other common names: Cahow

Aestrelata cahow

Nichols and Mowbray

, 1916,

south-eastern side of Castle Island, Bermuda


In past, sometimes treated as a race of P. hasitata. Recent molecular studies, however, indicate that present species may be closely related to P. feae and P. madeira, and also that all three (as well as P. hasitata) merit species status#R. Monotypic.


Subtropical waters of W Atlantic Ocean, breeding in Bermuda (on islets in Castle Harbour).

Descriptive notes

35–38 cm; 257–455 g; wingspan 85–92 cm. Brownish-grey petrel with blurry but usually conspicuous white horseshoe on rear body and mostly white... read more


Two principal vocalizations: the so-called Moaning Call and Excited Call are similar to the... read more


Marine and pelagic, seldom occurring near land except at colonies. Breeds on rocky offshore islets... read more

Food and feeding

Very little known. Apparently squid and crustaceans; probably also some fish; has been observed feeding over Sargassum algae off E... read more


Winter breeder, season starts with courtship in Oct or Nov, followed by a pre-laying exodus in late Nov to mid Dec, laying in late Dec/late... read more


Little known; probably disperses N or NW in subtropical Atlantic, following warm part of Gulf... read more

Status and conservation

ENDANGERED. Most recent overall population estimate by BirdLife International suggests that there are 250 individuals, with a minimum 142 mature individuals, although... read more

Recommended citation

Carboneras, C., Jutglar, F. & Kirwan, G.M. (2020). Bermuda Petrel (Pterodroma cahow). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 19 February 2020).