Lionhead rabbits are the product of breeding a Swiss Fox rabbit with a Netherland Dwarf rabbit. The result was a genetic mutation known as “the mane gene,” which causes long, wooly fur to grow specifically around the rabbit’s head. Aptly named for their thick manes, Lionhead rabbits come in two varieties: Single maned Lionheads have a mane encircling the head when young, but it may be wispy and usually diminishes as they age. Double maned Lionheads keep their thick mane for life and can even have longer fur around their flanks and back legs.