The Black Grouse or Black Cock (Tetrao tetrix), Fig. 69, a member of the family Tetraonidae, is about the size of a common fowl, though it is much heavier, and is distinguished by the male having the outer feathers of the tail curved outwards so that the tail is lyre-shaped. It does not pair, but on the return of spring the males assemble in great numbers, when a contest for superiority ensues, and continues with great bitterness till the vanquished are put to flight. It chiefly lives in high and wooded situations, and is still found on the moors of Scotland, feeding on various kinds of herbage and on berries.

The Black Grouse or Black Cock.

Fig. 69. - The Black Grouse or Black Cock.