Context: The name marsh tern refers to terns of the genus "Chlidonias", which are typically found in freshwater marshes, rather than coastal locations. The genus name "Chlidonias" is from Ancient Greek "khelidonios", "swallow-like", from "khelidon", "swallow"., The South Island or Te Waipounamu ("Mori") is the larger of the two major islands of New Zealand, the other being the smaller but more populous North Island. It is bordered to the north by Cook Strait, to the west by the Tasman Sea, and to the south and east by the Pacific Ocean. The South Island covers and is influenced by a temperate climate., A wetland is a land area that is saturated with water, either permanently or seasonally, such that it takes on the characteristics of a distinct ecosystem. The primary factor that distinguishes wetlands from other land forms or water bodies is the characteristic vegetation of aquatic plants, adapted to the unique hydric soil. Wetlands play a number of roles in the environment, principally water purification, flood control, carbon sink and shoreline stability. Wetlands are also considered the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal life., Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus "Rattus", the most important of which to humans are the black rat, "Rattus rattus", and the brown rat, "Rattus norvegicus". Many members of other rodent genera and families are also referred to as rats, and share many characteristics with true rats., The North Island or Te Ika-a-Mui ("Mori") is one of the two main islands of New Zealand, separated from the slightly larger but much less populous South Island by Cook Strait. The island's area is , making it the world's 14th-largest island. It has a population of , 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 and forages for freshwater fish , arthropods and worms . It has a predominantly grey plumage . Restricted to breeding in the eastern regions of South Island , it is declining and threatened by introduced mammals and birds ., Gulls, often referred to as seagulls, are seabirds of the family Laridae in the suborder Lari. They are most closely related to the terns (family Sternidae) and only distantly related to auks, skimmers, and more distantly to the waders. Until the 21st century, most gulls were placed in the genus "Larus", but this arrangement is now known to be polyphyletic, leading to the resurrection of several genera. An older name for gulls is mew, cognate with German "Möwe", Danish "måge", Dutch "meeuw", and French "mouette"; this term can still be found in certain regional dialects., Plumage ("feather") refers both to the layer of feathers that cover a bird and the pattern, colour, and arrangement of those feathers. The pattern and colours of plumage differ between species and subspecies, and may vary with age classes. Within species there can be different colour morphs., Terns are seabirds in the family Sternidae that have a worldwide distribution and are normally found near the sea, rivers, or wetlands. Previously considered a subfamily of the gulls, Laridae, they are now usually given full family status and divided into eleven genera. They are slender, lightly built birds with long, forked tails, narrow wings, long bills, and relatively short legs. Most species are pale grey above and white below, with a contrasting black cap to the head, but the marsh terns, the Inca tern, and some noddies have dark plumage for at least part of the year. The sexes are identical in appearance, but young birds are readily distinguishable from adults. Terns have a non-breeding plumage, which usually involves a white forehead and much-reduced black cap., The Inca tern ("Larosterna inca") is a seabird in the family Sternidae. It is the only member of the genus "Larosterna"., Subject: black-fronted tern, Relation: parent_taxon, Options: (A) area (B) bird (C) inca (D) laridae (E) larosterna (F) marsh tern (G) muroidea (H) plant (I) rat (J) tern
Output: marsh tern