1. Anglerfish


The male anglerfish has evolved in such a way as to be basically worthless. He is roughly three to four times smaller than the female and can't actually eat anything on its own. When the time is right and he's seen a female, he will be drawn to her instinctively. Then, he'll bite on to her, starting a strange process that will culminate in him melding into her, leaving nothing of him on the surface other than sexual organs. At one point, scientists thought that the Anglerfish was a single gender species.
2. Giant Squid

Being one of the largest animals under the sea would be cool at first but then when it comes to do the bedside tango, the male giant squid certainly has it cut out for him. It was thought the species was cannibalistic when parts of a fellow giant squid were found in the stomach of a specimen caught off Tasmania's west coast in 1999. But New Zealand based marine biologist Steve O'Shea later found out that it is actually accidental cannibalism during a bizarre mating ritual. When they mate, the female has a chance of taking chunks of flesh out of him.
3. Praying Mantis

Praying Mantis are pretty cool at first. Large insects that eat a variety of pests are always a welcome sight. However, the male of the species makes the ultimate sacrifice. During intercourse, the female praying mantis will eat the male praying mantis's head, ensuring that her offspring will survive. At the same time, I would hate for my first time to be so deadly.
4. Spiders

An interesting feature of reproduction among spiders is that many female members of the species will cannibalize their mates. Male spiders are very small compared to the female, often three to four times as such. Researchers believe that due to the size difference, he makes an easy meal for the mother to be.
The Black Widow and Australian Redback Spider are of the Latrodectus genus, which are collectively known as the “widow spiders” because most of the females occasionally consume the males. Sexual dimorphism is significant in these species with the females being much larger than the males. For example, the female black widow's body is approximately 1/2 inch long with the male's body being half that size or less. In Australian redback spiders , males have adapted to the potential threat by developing two palps (the organs used to inseminate females) so they can mate twice before potentially being devoured.
Female wolf spiders of some species will cannibalize both suitors and mates. Wolf spiders grow large and resemble tarantulas. A study of female wolf spiders found that potential mates were killed in 10 percent of encounters. More interestingly, the researchers discovered a correlation between mate consumption and offspring success. The offspring of females who ate their mates after copulation had a four-time greater chance for surviving the first month of life.
https://animals.mom.me/type-spider-kills-male-after-mate-10692.html
https://www.underwatertimes.com/news.php?article_id=47306105189
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