Blue-footed Booby vs Brown Booby

Blue-footed Booby

Sula nebouxii

Huge1.5 kgMarine

The blue-footed booby is on average 81 cm (32 in) long and weighs 1.5 kg (3+1⁄4 lb), with the female being slightly larger than the male. Its wings are long, pointed, and brown in color. The neck and head of the blue-footed booby are light brown with white streaks, while the belly and underside exhibit pure white plumage. Its eyes are placed on either side of its bill and oriented towards the front, enabling excellent binocular vision. Its eyes are a distinctive yellow, with the male having more yellow in its irises than the female.

ID text from Wikipedia, CC BY-SA 4.0

Photo: Ndecam from London, UK · CC BY 2.0

Brown Booby

Sula leucogaster

Large1.3 kgMarine

The booby's head and upper body (back) is covered in dark brown to blackish plumage, with the remainder (belly) being a contrasting white. The bare-part colours vary geographically, but not seasonally. The species also displays sexual dimorphism of the bare part colours, the males having a blue orbital ring, as opposed to the yellow orbital ring of the female. Female boobies reach about 80 centimetres (31 in) in length; their wingspans measure up to 150 cm (4.9 ft), and they can weigh up to 1,300 g (2.9 lb).

ID text from Wikipedia, CC BY-SA 4.0

Photo: Virtual-Pano · CC BY 4.0

Photos and recordings are credited to their authors under the licence shown. Full profiles: Blue-footed Booby and Brown Booby.