A major colony of roseate terns, a state and federally listed threatened species, is located on the roof of the Florida Fish and Wildlife Conservation Commission in Marathon, Fla., in the Florida Keys. It contains about 67 nests. The colony has been there since 1996, making monitoring the colony an easy day in the field for the state biologists working in the building below.

Read more in this article in the Florida Keys News/Marathon Free Press.

Photo: Alcides Morales, courtesy US Fish and Wildlife Service