When in “working mode,” the Collie’s tail hangs down between their back legs, although untucked. This keeps it out of the way of wayward hooves, should their livestock charges get a little feisty. The flare of white found at the end of both Standard and Border Collies’ tails has a special nickname: the Shepherd’s Lantern, as the bright white hue makes it easy to spot in low-light conditions. The word "Collie" may derive from the Scots word for 'coal' it may also refer to the related word 'coolly' referring to the black-faced mountain sheep of Scotland.