The loud, clattering outbursts of Clapper Rails are a signature sound of saltmarshes and mangroves in eastern North America and the Caribbean. It’s much rarer to catch sight of these large, chestnut-and-gray rails, as these shy birds emerge only briefly onto mudflats and quickly vanish again into the dense marsh grasses. King Rails can be very similar, but are typically more brightly colored and favor freshwater marshes.
Clapper Rail Identification, All About Birds, Cornell Lab of Ornithology
Ridgway's Rail: A Birdwatcher's Guide
Lifer Clapper Rail at Merritt Island NWR - catandturtle
Ridgway's Rail - Rallus obsoletus - Birds of the World
Clapper Rail Identification, All About Birds, Cornell Lab of Ornithology
Ghosts of the Cattails
King Rail Guide - New York Natural Heritage Program
Clapper Rail (Rallus longirostris) - North American Birds - Birds of North America
Clapper Rail Audubon Field Guide