Bizarre Sexual Dimorphism: Difference between revisions
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* Inversion: Female Spotted Hyenas have identical-looking genitals to males, with a "pseudopenis" and "pseudo-scrotum".
* Very common among arthropods:
** Spiders are infamous for examples of extreme dimorphism between the sexes. There is a tendency of the males to evolve into wanderers, spending their lives looking for more sedentary, web-bound females, resulting in them evolving to very different lifestyle requirements. For instance, in [
*** Male Salticids (jumping spiders) are often brightly colored and have very large "boxing glove" pedipalps in front, while females are brown or gray with small palps (P. audax, a common lab spider, is an exception to the color rule). Probably because Salticid females are very aggressive hunters, some species' males do elaborate (and hilarious) dances to increase the probability that females will recognize them as a mate rather than a snack.
*** In some species, the male will, after starting the process of sperm transfer (which is typically done with a pair of LEGS, spiders are weird), rotate their abdomen up toward the female's head and try to get her to EAT HIM. This is advantageous for the male, because it will provide her with valuable nutrition when she's finishing up the eggs he's fertilizing and putting them in their egg case. Given the longevity of these male spiders, and the travel time to the next female, he's extremely unlikely to ever encounter a second female anyway.
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