The squid is a sea creature with a relatively slippery body. The male bioluminescent sinus thief uses a mouth and sharp claws to tear a hole in the female spouse’s body, and then uses a penis-like appendage to implant the semen into the incision. In addition, the male squid uses a puncture method to implant the semen under the female skin, using a biochemical enzyme to dissolve the organ tissue. The sharp-edged Ino squid is the first known transgender squid. Some male squid are not only similar in appearance to males, but even have female sexual organs. Mating activities will last for a whole day.
Although scientists question the usefulness of this transsexual squid in the history of evolution, some researchers speculate that individual squid may potentially engage in heterosexual mating, but it is not detected.