Puppies are often described as looking similar to a red fox cub. Occasionally, abandoned European badger or red fox burrows are used. Silver foxes comprise up to 8% of Canada's red fox population. Less common creatures include beaver, bobcat, coyote, fisher, mink, muskrat, red fox, and river otter. Roe deer ("Capreolus capreolus"), badger and red fox are seen. The blended offspring of a silver and red fox is known as a cross fox. The Arctic fox is losing ground to the larger red fox. The red fox can run at up to . Alpine choughs have been observed diving at a Tibetan red fox. The average sleep time of a captive red fox is 9.8 hours per day. The introduced species red fox has single-handedly caused the extinction of several species. Other species than the red fox may be the quarry for hounds in some areas. The culpeo is a canid intermediate in size between a red fox and a coyote. It is sometimes confused with the red fox due to having patches of red hair. The red fox is a wide-ranging species.