As already reported in Brit. Birds (antea, Vols, xxxiii, p. 194, xxxv, p. 58, xxxvi, p. 143), a female Carrion Crow (Corvus c. corone) and a male Hooded Crow (Corvus c. comix) interbred in a wood in south Co. Dublin in 1939, 1940, 1941 and 1942. In 1943 they mated for the fifth time and built a nest in a Scots pine which was so slender that it could not be climbed. No young left the nest and it i...

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