Those fanciful male peacocks have nothing on frigatebirds! A male frigatebird has a throat sac that it can inflate with hard work - it takes over a period of twenty minutes - into a giant red, heart-shaped balloon. He then waggles his head from side to side, shakes his wings and calls the females to check him out.
A female frigatebird will mate with the male with the biggest and shiniest balloon. During sex, the male bird will sweetly put his wings over her eyes to make sure she doesn’t get distracted by other males with even nicer balloons!