Like other sea birds, tropicbirds are carnivorous animals as they feed primarily on fish. The flying fish is a favourite meal for the tropicbird along with the occasional squid or crustacean. The method of hunting used by tropicbirds is known as plunge-diving, and is common practise for many sea birds.
Due to their large size and airborne lifestyle, the tropicbird has few (if any) natural predators in it's environment. The primary predators of the tropicbird are small carnivores such as dogs, stouts and cats that have been introduced to areas by humans, and generally hunt the smaller tropicbird chicks.
Tropicbirds nest in dips, crevices and holes on the ground in large breeding colonies, usually found on cliff tops or small tropical islands. The female tropicbird lays a single egg, which hatches after being incubated by both parents for about 6 weeks. Both the male and female tropicbirds then feed their chick together until it fledges (flies away from the nest), at around 3 months old.
Today, tropicbird populations still seem to be thriving as they have not come under threat from drastic habitat loss. However, the arrival of non-native species to islands and increasing levels of water pollution, both have an affect on tropicbird populations.