Christmas frigatebird  (Fregata andrewsi)

The Christmas frigatebird is a very large, mostly black seabird with a glossy green sheen to feathers of the head and back (4). Females are larger than males (5); they have a white breast and belly, a narrow white collar around the lower neck and a whitish bar across the upperwing (4). Males are dark all over apart from a white patch on the lower abdomen. They have a red gular pouch, which becomes more vibrant in the breeding season and is inflated during mating displays (4). Juveniles have more mottled feathers on their upper-parts (2), a pale fawn head, white throat and a russet necklace (4). They take around four years to gain adult plumage (4).