The least tern is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the little tern of the Old World. Other close relatives include the yellow-billed tern and Peruvian tern, both from South America. High-pitched, squeaky calls include a ki-dik heard frequently from flying birds, often those carrying fish, and various alarm calls, including zwreep, kit-kit-kit-kit, and a lower-pitched krowk. Nesting birds also give specialized calls at the colony, between parents or between adult and chick. Here is a link to listen to their calls.
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Least Tern
The least tern is a species of tern that breeds in North America and locally in northern South America. It is closely related to, and was formerly often considered conspecific with, the little tern of the Old World. Other close relatives include the yellow-billed tern and Peruvian tern, both from South America. High-pitched, squeaky calls include a ki-dik heard frequently from flying birds, often those carrying fish, and various alarm calls, including zwreep, kit-kit-kit-kit, and a lower-pitched krowk. Nesting birds also give specialized calls at the colony, between parents or between adult and chick. Here is a link to listen to their calls.