The call of the common nighthawk (Chordeiles minor) was once a familiar sound in cities throughout New Hampshire, where they nested on gravel roofs and fed on insects attracted to city lights. In recent years, however, they’ve disappeared, but they still nest in Keene. Help keep track of this charismatic endangered species during a evening of nighthawk monitoring in downtown Keene on Tuesday, June 11, from 7:30 to 9:30 p.m.

The watch begins indoors with a brief introduction to nighthawk identification and ecology in the Putnam Science Center (Room 101) at Keene State College, then break into teams to look and listen for nighthawks in the twilight sky. No experience necessary, but registration is required. Information: email thelen @harriscenter.org or call 358-2065.

This event is co-sponsored by the Harris Center for Conservation Education, N.H. Audubon and Keene State College.