The whitetail deer is one of the most common native deer species in North America. It is a medium-sized deer, characterized by the white underside of its tail that can easily be seen when the deer is alarmed. Its fur color ranges from red-brown to grey-brown. Whitetail deer vary quite a lot in size. Bucks weigh in from 45 - 100 kg (100 - 275 lb) and also develop medium-sized antlers that can branch into several points along one main beam. Whitetails are highly adaptive herbivores that live in forests, as well as more open prairie-like environments. They do not pose a threat to humans and can run up to speeds of 75 km (47 mi) per hour when scared. They can also leap over obstacles as high as 2.7 m (8.9 ft).