Male spiders are on a JOURNEY

How to get it in without gettin eat-IN ya know?

One of the ways scientists studying the evolution of genitalia think that genitalia is shaped over time is by the requirement that one’s bits be mechanically compatible with the bits of another animal that one is trying to reproduce with. The much-contested “lock-and-key” hypothesis in morphology, if you will. Orb weaver spiders exhibit extreme sexual dimorphism-