Great frigatebird
Large seabird with the highest wing area to body mass ratio.
Wikipedia / Wikimedia Commons
The great frigatebird (Fregata minor) is a large seabird in the frigatebird family, found across tropical oceans. It is notable for its extreme sexual dimorphism, with females larger than males, and for the male's inflatable red gular sac used in courtship. The species nests in major colonies in the Pacific and Indian Oceans, with a tiny population in the South Atlantic.
- Scientific name
- Fregata minor
- Length
- 85–105 cm (33–41 in)
- Wingspan
- 205–230 cm (81–91 in)
- Male weight
- 1,000–1,450 g (2.20–3.20 lb)
- Female weight
- 1,215–1,590 g (2.679–3.505 lb)
- Diet
- Flying fish, other fish, squid, seabird chicks
- Conservation status
- Not specified in article
Lore & Background
The great frigatebird was formally described in 1789 by German naturalist Johann Friedrich Gmelin, who placed it in the genus Pelecanus and gave it the binomial name Pelecanus minor. Gmelin based his description on John Latham's 1785 'lesser frigate pelican,' which itself drew from George Edwards's 1760 account of the 'man of war bird.' Despite its common name, the species name minor (Latin for 'smaller') has been retained due to taxonomic rules. A Late Pleistocene fossil from Oahu is indistinguishable from the extant bird.
Five subspecies are recognized, distributed across the Indian, Pacific, and Atlantic Oceans. The species exhibits strong philopatry, breeding in its natal colony even after long migrations. One male traveled from Europa Island in the Mozambique Channel to the Maldives, 4,400 km away, for four months.
Great frigatebirds feed primarily on flying fish snatched from the ocean's surface, often in association with predatory tuna or dolphins. They engage in kleptoparasitism less frequently than other frigatebirds, obtaining at most 40% of food needs from stealing, and on average only 5%. Females and juveniles also hunt seabird chicks at breeding colonies.
Reader's Guide
The great frigatebird is a key species for understanding seabird ecology in tropical oceans. Its extreme wing morphology—the highest ratio of wing area to body mass of any bird—allows it to exploit marine thermals for efficient long-distance foraging. The species' wide distribution across the Pacific, Indian, and Atlantic Oceans, combined with its philopatric breeding behavior, makes it a model for studying population connectivity and dispersal. Its kleptoparasitic behavior, though less prominent than in other frigatebirds, illustrates the complex feeding strategies within seabird communities. The fossil record from the Late Pleistocene of Oahu confirms the species' long-term presence in the Pacific. The taxonomic retention of the name minor despite the bird's large size highlights the quirks of scientific nomenclature. Conservation concerns are implied by the small Atlantic population restricted to a few islands, though the article does not specify threats or status.
Did You Know?
- The great frigatebird has the highest ratio of wing area to body mass of any bird.
- Males inflate a red gular sac over 20 minutes to attract mates.
- One male traveled 4,400 km from Europa Island to the Maldives.
- A Late Pleistocene fossil from Oahu is indistinguishable from the modern bird.
Frequently Asked Questions
What is the Great Frigatebird?
The Great Frigatebird (Fregata minor) is a large tropical seabird in the frigatebird family, distinguished by having the highest wing-area-to-body-mass ratio of any bird. It ranges across the tropical Pacific, Indian, and a small stretch of the South Atlantic Oceans.
Why is the male's red throat sac so famous?
During courtship, the male inflates a vivid red gular sac to impress females, creating one of the most eye-catching displays in the bird world. The sac is unique to males and is central to the species' mating ritual.
What does a Great Frigatebird eat?
This aerial predator feeds mainly on flying fish, other small fish, and squid, and will also raid nests to take chicks from other seabirds. It is an opportunistic hunter that almost never dips into the water to feed.
How big is a Great Frigatebird?
Adults measure roughly 85 to 105 cm in length with a wingspan stretching up to 230 cm, making them one of the largest members of the frigatebird family. Females are noticeably heavier than males, weighing around 1,215–1,590 g compared to the male's 1,000–1,450 g.
Where do Great Frigatebirds nest?
They form major breeding colonies on islands scattered across the tropical Pacific and Indian Oceans, with a very small population also present in the South Atlantic. These colonies rank among the largest seabird nesting sites in their respective ocean basins.
More in Birds of the Pacific Ocean 1-24
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