The black-fronted tern (Chlidonias albostriatus), also known as sea martin, ploughboy, inland tern, riverbed tern or tarapiroe, is a small tern generally found in or near bodies of fresh water in New Zealand, where it forages for freshwater fish, arthropods and worms. It has a predominantly grey plumage. Restricted to breeding in the eastern regions of the South Island, it is declining and threatened by introduced mammals and birds. It is rated as endangered on the International Union for Conservation of Nature (IUCN)'s Red List of Threatened Species.
Measuring 29 cm in length, the adult tern has predominantly grey plumage with a black cap typical of many terns. The underparts and rump are white, and there is a thin white streak running along the cheeks underneath the cap. The bill is red and legs orange. The black cap recedes from the bill in non-breeding plumage and becomes flecked with white.