So far the evidence for the purpose of penis spines is all a bit inconclusive. This might be a way to force their sperm onto reluctant females. So far there isn't a definitive answer to the question of why male bats have spines on their penises. Instead, they are the penis spines of a bat. Bats have complicated post-coital lives. What are they for, and why do their sizes and shapes vary so much? In tree-roosting bats, which include hoary bats and eastern red bats , it's possible their remarkably long penis spines evolved to facilitate this locking. One such species is the bed bug. Working with her supervisor Patricia Brennan , she has been taking a closer look.
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