0

Next airing Tue Aug 4, 7 p.m. ET

Swingers

High in the frozen Japanese Alps, female snow monkeys engage in same-gender sex. Across the African savannah, "Lion Kings" enjoy intimate male friendships. A pretty seahorse is not just a dad, he's a pregnant dad. And a Mexican whiptail lizard is about to experience a virgin birth. In nature, gender is as flexible as life itself. Meet the World's Weirdest Swingers.

Advertisement