The White tern is a very elegant and delicate seabird, with immaculate all-white plumage. The small eyes surrounded by black rings make them seem much larger. Adults look the same, but juveniles have a brownish-gray back and gray on their neck, with a black mark behind their eye. These dainty terns fly in an undulating pattern with deep, slow wingbeats, which, although it appears erratic, is very strong and enables sustained periods of hovering.
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DiurnalDiurnal animals are active during the daytime, with a period of sleeping or other inactivity at night. The timing of activity by an animal depends ...
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CarnivoreA carnivore meaning 'meat eater' is an organism that derives its energy and nutrient requirements from a diet consisting mainly or exclusively of a...
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PiscivoresA piscivore is a carnivorous animal that eats primarily fish. Piscivorous is equivalent to the Greek-derived word ichthyophagous. Fish were the die...
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TerrestrialTerrestrial animals are animals that live predominantly or entirely on land (e.g., cats, ants, snails), as compared with aquatic animals, which liv...
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SeabirdSeabirds (also known as marine birds) are birds that are adapted to life within the marine environment. While seabirds vary greatly in lifestyle, b...
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Pelagic birdsPelagic birds live on open seas and oceans rather than inland or around more restricted waters such as rivers and lakes. They feed on planktonic cr...
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PrecocialPrecocial species are those in which the young are relatively mature and mobile from the moment of birth or hatching. Precocial species are normall...
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CongregatoryCongregatory animals tend to gather in large numbers in specific areas as breeding colonies, for feeding, or for resting.
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OviparousOviparous animals are female animals that lay their eggs, with little or no other embryonic development within the mother. This is the reproductive...
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Soaring birdsSoaring birds can maintain flight without wing flapping, using rising air currents. Many gliding birds are able to "lock" their extended wings by m...
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SeabirdSeabirds (also known as marine birds) are birds that are adapted to life within the marine environment. While seabirds vary greatly in lifestyle, b...
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MonogamyMonogamy is a form of relationship in which both the male and the female has only one partner. This pair may cohabitate in an area or territory for...
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Not a migrantAnimals that do not make seasonal movements and stay in their native home ranges all year round are called not migrants or residents.
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White terns breed in subtropical and tropical South Atlantic, Pacific and Indian Oceans. They are a pelagic bird that lives in oceanic areas, relatively close to coral breeding islands with some vegetation, where it will nest in bushes and trees, foraging over deep ocean waters.
White terns are often seen on their own or in small groups. They are a diurnal species, but are more active at dawn and dusk. To eat, it dips its beak to catch prey at the water’s surface or just beneath it. A dive is often preceded by extensive hovering, and the bird may use the wind to sustain its flight. It may catch flying fish from the air, and it is commonly seen foraging near groups of predatory fish and dolphins which drive their prey towards the surface. An individual may carry a few small fish in its bill, taking these to its young with the prey held crosswise. If disturbed by a predator, a White tern will hover, flutter and make buzzing sounds. This bird has a graceful flight. It flies easily low above the waves, without landing. It will touch the surface once it has spotted prey. Its flight is buoyant, involving erratic changes in speed and direction.
White terns are carnivores (piscivores), they mainly eat small fish and squid, and sometimes crustaceans.
White terns are monogamous and pairs remain with each other for several seasons, returning every year to the same nesting site. These birds nest in loose groups or singly. They can breed at any time during the year, but there are peaks from late spring until early summer. At the start of the breeding season, pairs engage in aerial displays, flying with each other. They probably do courtship feeding, with the male giving some prey to his mate, and mutual preening while perched on a branch. These birds do not build a nest. Sometimes they will scratch the bark of a short branch high in a tree, to make a small shallow depression, using their feet and bill to do so. The egg is sometimes laid on a roof or other surface, but always on a bare surface. One speckled egg is laid and incubation is for about 36 days, by both parents. The chick is brooded in its branch nest. Both parents feed their chick every 3 hours, bringing small fish or squid. The young fledges at around 48 days of age, when it moves into the area surrounding the nest site. It returns to the nest branch only for feeding. Both parents feed it for 2 more months. Young reach maturity at around 3 to 5 years.
Although currently not at risk of extinction, White terns are threatened by predation from cats and rats, introduced onto some of their breeding islands. This has caused some populations to decline and others have disappeared.
According to the What Bird resource, the global White tern population size is around 160,000 to 1,100,000 individuals. The Hawaii Comprehensive Wildlife Conservation resource records the total population in the Hawaiian Archipelago of the White tern as 15,000 breeding pairs, with the largest populations being on Midway (7,500 pairs), Laysan (1,000 pairs) and Nihoa (5,000 pairs). On O‘ahu Island between 1961 and 2005, pairs increased from one to more than 250. The worldwide population probably exceeds 100,000 breeding pairs. Overall, currently White terns are classified as Least Concern (LC) on the IUCN Red List and their numbers today remain stable.
Social animals are those animals that interact highly with other animals, usually of their own species (conspecifics), to the point of having a rec...