Same-Sex Overtures Across Species
Clive Druett / Papilio / CORBIS
Dung flies
Some males may mount other males as a way to keep them down, quite literally to keep them from accessing available females that are flying overhead. The dominant male dung flies then use the opportunity to get to the females first.
Get the Latest Photos from Time.com
Get TIME photos and pictures of the week delivered directly to your inbox.