155973 Black Grouse Tetrao tetrix L 40-45cm. Bulky moorland gamebird. Males display at traditional leks to interest nearby females. Sexes are dissimilar. Adult male has mainly dark plumage with red wattle above eye. Displaying birds elevate and spread tails (which look lyre-shaped) and reveal white undertail coverts. In flight, tail looks long and forked; wings have white bars. Adult female has orange-brown plumage finely marked with dark bars. In flight wings show narrow white bar. Juvenile resembles a small female with subdued markings. Voice Displaying male utters a bubbling, cooing call. Status Scarce and declining in many areas. Does best on moorland comprising mosaic of grassland, heather moorland, bilberry stands and adjacent woodland.