From spraying mates with urine to changing one's sex, these are the most intriguing courtships in the animal kingdom.

Sloths are some pretty interesting animals. Beyond their reputation for being slow, a host of different traits reveals a lot ...

Grab fast and hang on for hours. A fierce grip is all the courtship finesse a male frog needs in species that reproduce in frenzied mobs. Female European common frogs, however, have at least three ...

Some animals, from puffins and swans to prairie voles, are known to mate for life. For female mosquitoes, mating typically occurs once in their lifetime—lasting under 30 seconds—before the couple go ...