Image Source
Info Source:
The Cornell Lab of Ornithology

Least Tern

These 8 to 9 inch birds have a black “crown” on their head, a snowy whiter underside and forehead, grayish back and wings, orange legs, and a yellow bill with a black tip. Least terns hover over and dive into standing or flowing water to catch small fish. Least Terns live near seacoasts, beaches, bays, estuaries, lagoons, lakes and rivers and breed on sandy or gravelly beaches and banks of rivers or lakes.

Dams, reservoirs, and other changes to river systems have eliminated most historic least tern habitats. The wide channels dotted with sandbars that are preferred by the terns have been replaced by narrow forested river corridors. It is federally classified as endangered, as well as classified as threatened or as a species of concern for most states because of loss of nesting habitat. Interior population federally listed as endangered in 1985.