any of various rails or raillike birds.
any bird that frequents marshes and swamps, esp a rail, coot, or gallinule
Collins English Dictionary - Complete & Unabridged 10th Edition
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The king rail's preference for freshwater marshes has led to two other common names, marsh hen and freshwater marsh hen.
These are the long-billed marsh wren, the clapper rail or marsh hen, and the seaside sparrow.