CANBERRA, Australia, June 15 (UPI) -- For banana fiddler crabs, Uca mjoebergi, coerced copulation is a fact of life. New research shows some male crabs ensure offspring by cornering mates in small burrows.
Not all fiddler crab sex is non-consensual. Males court and compete for females, pitting their size, coloration and claw-waving abilities against one another in hopes of winning a would-be mate's affection. A female might consider as many as 20 males before making a decision.