Family Gannets, Boobies (Sulidae)

Least Concern

Nazca Booby (Sula granti)


Taxonomy

French: Fou de Grant German: Nazcatölpel Spanish: Piquero nazca
Taxonomy:

Sula granti

Rothschild

, 1902,

Culpepper (Darwin) Island, Galapagos Archipelago

.

Until recently considered conspecific with S. dactylatra, but breeds sympatrically and assortatively with it, differing in its orange (not yellow) bill and greater sexual dimorphism; compared with sympatric form personata, has shallower bill, shorter tarsus and longer wing; legs and feet olive-khaki to purple vs bright yellowish in dactylatra, but dark bluish-grey to olive-grey in personata; also differs in foraging preference, concentrating near shore, not out to sea; and in typical use of steep slopes, and not flat areas, for nesting. Monotypic.

Distribution:

Breeds on islands in CE Pacific from NW Mexico S, including Revillagigedo Is, Clipperton I, Cocos I (S of Costa Rica) and Malpelo I (off W Colombia), to Galapagos Is, La Plata I (Ecuador) and, more recently, Lobos de Afuera (NW Peru).

Descriptive notes

Resembles Masked Booby (S. dactylatra) but adult has coral-pink bill with yellower tip, legs khaki to dark greyish olive, iris golden-yellow to orangey, central... read more

Voice

Probably similar to Masked Booby but no specific information available.

Habitat

Strictly marine and fairly pelagic. Prefers deeper waters than other boobies; in Galapagos, feeds... read more

Food and feeding

Shoaling fish, especially flying-fish (Exocoetidae) up to 28 cm long, generally taking larger prey than other boobies, including fish up to... read more

Breeding

Breeds in loose colonies on oceanic islands. The large breeding colony on the Galapagos Is breeds during October–June. Clutch size is one... read more

Movements

Most adults spend all year in vicinity of colonies. However, young birds and some adults may... read more

Status and conservation

Not globally threatened (Least Concern). Found breeding off NW Peru (Lobos de Afuera Is) in 2004 and subsequently. Has a very large colony on Malpelo Is, Colombia, estimated... read more

Recommended citation

del Hoyo, J., Collar, N. & Garcia, E.F.J. (2018). Nazca Booby (Sula granti). 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 https://www.hbw.com/node/467294 on 10 December 2018).