caulker n also corker. American bittern (Botaurus lentiginosus).
   1870 Can Naturalist v, 292 The American bittern makes a curious thumping noise, very much resembling the noise made by fishermen when driving oakum into the seams of their boats; hence ... 'corker' (?caulker) in Newfoundland. 1967 Bk of Nfld iii, 282 ~ (from the notes likened to the sounds made by pounding caulkings into the seams of a boat.)

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