Located in the Pacific Ocean, midway between Hawaii and Australia, Tuvalu, the fourth smallest country in the world, consists of three reef islands and six true atolls, with poor soil and limited fresh-water resources. As a result, indigenous plants are rare, as well as the animal life. Twenty eight species of indigenous birds are known, approximately 20 species being sea birds, a few of which are migratory. One of this birds species is the Crested tern (Thalasseus bergii), a seabird in the tern family that nests in dense colonies on coastlines and islands in the tropical and subtropical regions, in the area from South Africa around the Indian Ocean to the central Pacific and Australia
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