The Christmas frigatebird ("Fregata andrewsi"), or Christmas Island frigatebird, is a seabird of the frigatebird family "Fregatidae" which is an endemic breeder in the Indian Ocean.

The Christmas frigatebird is a large lightly built seabird with brownish-black plumage, long narrow wings and a deeply forked tail. The male has an egg shaped white patch on his belly and a striking red gular sac which he inflates to attract a mate.

The female is slightly larger than the male and has a white breast and belly. They feed on fish taken in flight from the ocean's surface (mostly flying fish), and sometimes indulge in kleptoparasitism, harassing other birds to force them to regurgitate their food.

It measures 89–100 cm (35–39 in) in length, has a wingspan of 205–230 cm (81–91 in) and weighs around 1,550 g (3.42 lb). The Christmas frigatebird is endemic to Christmas Island and breeds in only four main nesting colonies.

In 2003 there were 1,200 breeding pairs but as frigatebirds normally breed every other year, the total adult population was estimated to be between 3,600 and 7,200 individuals. The species has a small population and breeds on just one island. It is therefore listed by the International Union for Conservation of Nature as "Critically Endangered".

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