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Image   •   Oct 25, 2012 17:05 BST

When a female mates with several males, these will compete over the fertilization her eggs. This is an important evolutionary force that has led to the evolution of a diversity of male sexual organ morphologies shows a study on seed beetles. Photo: Göran Arnqvist
License Creative Commons Attribution, no derivatives (?)
Size 69.2 KB
Format .jpg
Image dimensions 450 x 338 pixels