The Red-billed Tropicbird, also known as Phaethon aethereus, is a species of seabird in the family Phaethontidae. This striking bird is easily recognized by its long, white tail streamers, bright red bill, and black eye markings. It has a predominantly white body with black markings on its wings and a black stripe running from the eye to the nape. Red-billed Tropicbirds are found in tropical and subtropical waters around the world, including in Vietnam.

These birds are pelagic, meaning they spend most of their time on the open ocean and come to land only to breed. They prefer islands and rocky cliffs, where they nest in crevices or burrows. During the breeding season, which occurs from February to August in Vietnam, they form pairs and engage in elaborate courtship displays. The female lays a single egg, which both parents take turns incubating.

Red-billed Tropicbirds feed mainly on fish, which they catch by plunge-diving into the ocean from heights of up to 30 meters. They are strong fliers and are known for their ability to stay aloft for long periods of time without flapping their wings.

Despite being widespread and relatively common, the Red-billed Tropicbird faces several threats, including habitat destruction, egg collection, and predation by introduced mammals. Conservation efforts are underway in some areas to protect breeding colonies and raise awareness about the importance of preserving these unique and beautiful birds

Habitat and Distribution – Red-billed Tropicbird Of Vietnam

The red-billed tropicbird is found in tropical and subtropical regions of the world, including the Indian and Pacific Oceans, the Caribbean, and the eastern coast of South America. In the Western Pacific, its range extends from southern Japan to Australia, while in the Indian Ocean, it is found from eastern Africa to Indonesia. In the Atlantic, it is found in the Caribbean, along the northern coast of South America, and around the Cape Verde Islands. Within this range, the red-billed tropicbird is known to breed on small, rocky islands and atolls. They prefer islands that have steep cliffs or slopes and a lack of vegetation, which helps to minimize the risk of predators.


The Red-billed Tropicbird is a graceful and agile seabird that is known for its spectacular aerial displays. They are usually solitary, but during the breeding season, they may form small groups. These birds are known for their aerial prowess and are capable of sustained flight, even in strong winds. They are also known for their courtship flights, where they fly in circles around each other, with their bills pointed upwards.

Red-billed Tropicbirds are also known for their distinctive and evocative calls. Their vocalizations are often heard before they are seen, and they can be heard from a great distance. They use their calls to communicate with each other, and also to locate their breeding sites.

Red-billed Tropicbirds are also skilled divers, and they feed mainly on small fish and squid. They dive into the water from heights of up to 30 meters, using their long tail feathers to steer themselves as they descend. They are also known to feed on planktonic crustaceans and other small invertebrates.

When it comes to their breeding behavior, Red-billed Tropicbirds are monogamous and form pairs during the breeding season. They breed on tropical islands, where they build nests on steep cliffs or in crevices, often near the ocean. Both parents share the incubation and care of the chick, which takes around two months to fledge

Conservation Status

The Red-billed Tropicbird is currently listed as a species of “Least Concern” by the International Union for Conservation of Nature (IUCN). This is due to its relatively large population size and wide geographic range, which spans tropical and subtropical oceans around the world. However, like many other seabird species, the Red-billed Tropicbird faces a number of threats, including habitat loss, predation by introduced species, and accidental capture in fishing gear.

Climate change may also impact the availability of the small fish and squid on which this species feeds. Conservation efforts are ongoing to monitor and protect breeding colonies and nesting sites, as well as to mitigate threats from human activities such as development and overfishing. Education and awareness-raising programs are also being developed to promote the importance of seabird conservation and the need for sustainable practices in coastal and marine environments.

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