Much is happening below ground at this time of year, including the birthing of red fox pups. In late March or early April, about 7 weeks after mating, female foxes give birth to four to ten young. Each pup weighs about a quarter of a pound, and the white tip of its tail is often already evident. During the first month, the pups grow a dark grey coat (they shed this coat and grow a sandy-colored coat about the time they venture out of their den, which is usually dug in a sandy bank). The mother stays with her young in the den, nursing and curling her body around them to help keep them warm for about two weeks, while the father brings her food. She then resumes her normal activity, returning to the den to nurse, clean and play with her pups.