Northern Gannet vs Masked Booby

In short

The Northern Gannet and Masked Booby are large seabirds with similar body shapes but differ in plumage and distribution. The Northern Gannet is primarily found in the North Atlantic, while the Masked Booby is more tropical. Key differences include the gannet's black wingtips and the booby's distinctive facial mask.

Identification tips

1. Look for the black wingtips on Northern Gannets, which are absent in Masked Boobies. 2. Note the black facial mask of the Masked Booby. 3. Consider the location: Northern Gannets are in the North Atlantic, while Masked Boobies are in tropical regions. 4. Juvenile plumage can be confusing; focus on adult features for reliable ID.

Size

Both species are large seabirds, but the Northern Gannet is generally bulkier than the Masked Booby.

Plumage

Adult Northern Gannets are mostly white with black wingtips, while Masked Boobies have a white body with a black face mask and tail. Juvenile gannets have mottled brown plumage, which can cause confusion with immature boobies.

Behaviour

Both species are plunge-divers, but Northern Gannets often forage over longer distances from their colonies. Masked Boobies may show less fear of humans in some populations.

Habitat

Northern Gannets breed in the North Atlantic, often on steep cliffs, while Masked Boobies are found on tropical islands and atolls.

Voice

Vocalizations are not a primary distinguishing feature in the field, as both species have similar calls typical of seabirds.