The Encyclopedia Americana (1920)/Blackcock

BLACKCOCK, or HEATHCOCK, a large European grouse (Tetrao tetrix), so called because of the glossy black color of the cock; also known as blackgrouse. The female is grayish, mottled in darker colors, and is called &ldquo;grayhen,&rdquo; or &ldquo;heathhen&rdquo;; the young are called &ldquo;poults.&rdquo; See.