https://www.quora.com/Is-it-possibl...feelings-something-that-occurs-only-in-humans
Oddly, humans are not the only animals that engage in cross-dressing or have transgender identity issues; a lot of animals also have "gender-bender" sex lives.
Garter snakes, for example, not only engage in orgiastic bouts of group sex, but male cross-dressing garter snakes also show up for the festivities, oozing a female sex pheromonedesigned to confuse the other male snakes and give the cross-dressing snake (or so the theorists say) an opportunity to get in and inseminate the female before it is picked off by a predator.
The hyena is another cross-dresser, with male and female hyenas appearing to present both sets of sexual organs. In fact, hyenas are not true hermaphrodites, simply such good pseudo-hermaphrodites that the ancient Greeks were convinced they could change from male to female at will.
Then, of course there are fish, which really
canchange from male to female (and back again) at will. It turns out that if you toss a school of female salmon or hammerhead sharks in a tank, some will morph into working males.
Scientists call these sex-change artistssuccessive hermaphrodites, and the phenomenon is far from uncommon. In fact, a huge number of fish (more than 100 species) will readily change genders, and some speseahorse fish routinely changegenders several times over the course of their lives.
Along with piscine sex-change artists, you also have fish that are
simultaneous hermaphrodites. These are fish which come equipped with both testes and ovaries, and which normally produce eggs for about half their spawns, and sperm the other half.
There are other types of gender benders as well:homosexual seagulls, dogs, sheep and beaver, for example, and the occasional female bird which (due to disease, age or congenital defect) starts producing testosterone and develops both male plumage and a male sex drive.
At least one species of African frog is a sex-change artist, and in quite a few species of animals, the male takes over the duties normally "assigned" to females, such as is the case with the seahorse
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