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Sterna paradisaea
Diet
Small fish and marine invertebrates
Habitat
Arctic coasts; open ocean outside breeding season
Range
Circumpolar, migrating to Antarctic waters
The Arctic tern is a slender grey-and-white seabird with a black cap, red bill and very long tail streamers. It breeds around northern polar coasts, then migrates to Antarctic waters, experiencing two summers each year. Agile birds hover and plunge for small fish and marine invertebrates and fiercely defend their ground nests from intruders (Wikipedia, general species account). It is Nationally Least Concern (Thailand Red Data 2025).