Male dolphins are extremely rapey.
Male bottlenose dolphins are known to form gangs that abduct females of their kind, who they then proceed to violently rape for weeks and weeks. When the poor female tries to leave, they slap and abuse her.
Oh, and if there are no females around, they’ll rape a male instead.
Even worse, male dolphins will kill their mate’s babies to ensure she doesn’t lose interest in mating. They’ve also been known to kill baby porpoises as practice.
Dolphins carry STIs.
LOTS and LOTS of STIs.
Dolphins really like to have sex – they even masturbate a lot – so they’re factories of sexually transmitted infections, which they spread among their kind. So next time you see a dolphin, just know that it probably has the dolphin version of the clap.
Dolphins engage in "nasal intercourse."
Which is exactly what it sounds like. Male dolphins stick their penises into the blowholes of other dolphins and they stimulate themselves.
Nature is fascinating.
Dolphins have a brutal way of killing octopi.
See, octopi are really smart animals – so smart, they have a decentralized nervous system, which means some of their neurons are in their tentacles.
Because of this, the tentacles will keep moving even after other parts of the creature is dead, trying to escape.