Learn about reindeer, in this video from NOVA’s Gross Science series. When reindeer antlers begin growing, they are soft and covered in a thin layer of skin called velvet. The velvet transports oxygen and nutrients to help the antlers grow quickly. However, when the antlers harden, the velvet is shed. The process of removing the velvet gives the antlers a bloody appearance. Reindeer also have adaptations, such as the ability to see UV light, that help them live in snowy areas. UV vision allows reindeer to find food and spot signs of predators in the snow-covered landscape. This resource is part of the NOVA: Gross Science Collection.