Clapper Rail Identification, All About Birds, Cornell Lab of

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.

Quantitative acoustic differentiation of cryptic species illustrated with King and Clapper rails - Stiffler - 2018 - Ecology and Evolution - Wiley Online Library

Lifer Clapper Rail at Merritt Island NWR - catandturtle

Birds – BirdNation

California Clapper Rail (Rallus longirostris obsoletus)

Clapper Rail - eBird

Ridgway's Rail: A Birdwatcher's Guide

King Rail- Species At Risk in The Land Between

Behavior - Clapper Rail - Rallus crepitans - Birds of the World

Birds Seen in Northern California