The Capercaillie, which belongs to the grouse family, became extinct in Scotland in the middle of the 18th century and was reintroduced in the middle of the 19th century. Unfortunately due mainly to hunting, their numbers have now dwindled to approximately 1000 which places them not only on the endangered list but in grave danger of extinction in the wild. The name Capercaillie is gaelic and translated means horse of the forest.
I suspect that this descriptive name was given to this bird because in the mating season, the male makes a clip clopping sound to attract the females (amongst other calls).
This one was very interested in my camera.