The huge ears of the Antelope Jackrabbit.
The Antelope Jackrabbit (Lepus alleni) is a species of North American hare found in southern Arizona and northwestern Mexico and it inhabits dry desert areas.
Its extremely long ears can grow between 14–17 cm (6 in) and make up about a third of its total body length.
Their function is not only for providing the jackrabbit with excellent hearing but also help to regulate its body temperature by expanding and contracting the blood vessels webbed throughout them.
