Arctic tern in flight, Hall Beach, Nunavut, Canadian High Arctic. This tern migrates between Greenland/Iceland and Antarctica twice a year, a round trip of miles - the longest migration of any known animal.
Whiskered Tern. Terns are birds that are normally found near the sea, rivers or wetlands & typically breed in noisy colonies and lay their eggs on bare ground with little or no nest material. However, the marsh terns construct floating nests from the vegetation in their wetland habitats, and a few species build simple nests in trees, on cliffs or in crevices. The sexes are identical in appearance, but young birds are readily distinguishable from adults.