The Most Brutal Animal Courtships: Cannibalism, Barbed Penises, and Tons of Poison

Cutting, biting, slashing, and cannibalism are not words that we naturally associate with love. But there is beauty and splendor in the dark side of animal mating, too.

This article takes a closer look at eight of the strangest courtship behaviors in the animal kingdom.

nailed to you

Monkfish

Some male anglerfish often attach themselves to passing females, reducing them to little more than brainless sperm sacs. This is called “parabiosis,” where two organisms combine to develop a shared physiological system. Monkfish are the only known example of symbiotic symbiosis in nature.

Anglerfish develop symbiotic relationships in response to the vastness of the deep sea, where encounters between the sexes are rare and rare. A male bites the first female he encounters because it’s a safer choice than gambling with another female who may never arrive.

Biologists to investigate how anglerfish achieve symbiosis Dr. Thomas Boehm Researchers at the Max Planck Institute for Immunobiology and Epigenetics in Germany tested the DNA of 31 specimens from 10 species of monkfish.

They discovered that the monkfish species, which are fused male and female, lack important immune system genes. Somehow they are compromising the immune system to allow parabiosis without suffering any negative effects.

Understanding how anglerfish manage this trick could facilitate future blood transfusions and organ transplants and have important implications for medicine.

Why did it have to be a snake?

red-sided garter snake

Snakes have two penises instead of just one. These organs, known as hemipenes, allow male snakes to mate with snakes from various directions. This is especially useful for red-sided garter snakes, which form chaotic “mating balls” during mating season in which males outnumber females 100 to 1.

This situation occurs because male snakes wake up from hibernation before females, causing a temporary imbalance in the sex ratio.

To increase the probability of mating success, the hemipenes of many reptile species have evolved complex spines that lock into place during copulation. In red-sided garter snakes, the hemipenis has a large spine that is inserted into the female during copulation.

Hemipenes are impressive, but that’s only half the story. By anesthetizing the female reproductive organs of red-sided garter snakes, A team of zoologists discovered in 2014 that: Anesthetized females spent longer mating than females that were not anesthetized..

This finding suggests that by contracting the genital opening and vagina, females may be able to forcefully reject male advances and thwart an unworthy partner’s chances of success.

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I can’t get you out of my head

sea slug

Earlier this year, scientists discovered a type of nudibranch (Siphopterone Maxig) It stabs the partner directly in the center of the head with poisonous spurs, in the throes of love.

This spur (attached to the penis), called a penile stylet, injects a complex cocktail of hormones directly into the lover’s brain, increasing the odds of a successful copulation.

This is just one of the many reproductive oddities that nudibranchs have evolved. Some nudibranchs even “kiss” their bodies mouth-to-mouth before transferring their sperm. After mating, sea slugs can also “cuddle” by wrapping their colorful bodies around each other.

“Maybe ‘hugging’ is akin to protecting your spouse,” he says. Cheyenne Tatean experienced sea slug observer at the University of Massachusetts Amherst.

“The threat to their reproductive success is that their sperm gets digested by their partner before it can be used for fertilization. And ‘hugging’ gives sperm a chance to travel deeper within their partner’s reproductive tract. You can get it. ”

Most people think that sea slugs, like many invertebrates, are primitive lower orders of bony animals with large brains. Their rich and duplicitous sex lives suggest otherwise.

please bite me

redback spider

The case of male spiders is complicated. To prepare for sex, they must first ejaculate onto a small web and then collect the semen in a pair of syringe-like appendages near their mouth known as palps.

Locked and loaded, the male spider must approach the female and insert its antennae into the female’s reproductive passageway, being careful not to activate the predatory kill reflex. The female’s reproductive tract happens to be just a few millimeters from the venomous fangs.

To limit the chance of being eaten, male spiders have evolved complex dances to clearly communicate their sexual intentions.

Some offer gifts to the female to keep her entertained while the sperm transfer takes place. But male redback spiders go one step further: During mating, the male somersaults balletically into the female’s jaw, encouraging her to bite.

This self-sacrifice gives men two bonuses. The first one, The longer it takes to snack, the more eggs his sperm can fertilize.

Second, females that have just eaten a male appear to be more likely to reject the next male that comes along.

cupid’s arrow

garden snail

During courtship, some species of snails periodically fire chemical-tipped arrows at each other, like the garden snail pictured here.

And since snails have both female and male reproductive organs, these arrows (or “love darts”) often fly in both directions.

“The purpose of the love dart is not to kill the mate, but to introduce bioactive substances that affect the mate’s reproductive process,” states Dr. Joris M. Corne of the Amsterdam Institute for Life and Environmental Research.

The substances contained in love darts contain a rich cocktail of special compounds (known as allomones) that prevent sperm from being lost within the reproductive tract of a potential mate if mating takes place.

Each species of snail has its own unique shape. Some love darts are curved like a harpoon. Some have thorns. Some have diamond-shaped tips, like decorated spears.

Can misfires cause fatalities? “I’ve occasionally seen darts go straight into the recipient’s head, and the recipient survived.” says Joris M. Corne.

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It’s not cricket

mugwort cricket

For sage crickets, sex is all about give and take. The male takes his time during mating to ensure that he can transfer as many sperm as possible.

But to do that, you have to offer something of yourself: your wings.

Female western crickets not only devour the male’s feathers during mating, but also drink blood-like fluids that leak from the male’s wounds.

her hunger is so bad During this placement, a man’s weight can decrease by 10%.

But men have even more talents. His sperm is encased in a slimy shell, which the female can eat if she wants.

John Cricket’s bizarre mating habits are one of many spectacular arrangements that have evolved between sexes.

These tactics and strategies help zoologists explore the economics of animal sexual reproduction, sometimes reshaping our understanding.

About how evolution works.

I’ll happily eat it

praying mantis

“Cannibalism has its advantages,” says Nathan Burke, a postdoctoral researcher at the University of Hamburg, who studies the mating strategies of praying mantises.

“It can lead to improved growth, condition and reproduction in cannibals. What makes many praying mantises and spiders different from other cannibals is that they also cannibalize in mating situations, usually eating the male. That means it’s only female.”

Burke is particularly interested in the wrestling matches that some praying mantis species engage in before mating. Wrestling matches involve violent grappling and violent contests between males and females who scrape their paws together.

If the female wins these struggles, the male will almost certainly be eaten. However, if the male wins, there is a good chance of mating.

Why sexual cannibalism is so rare among insects remains a subject of debate.

“The thing about praying mantises is that they are mostly sit-and-wait predators. They don’t move around looking for food, they patiently wait for food to come to them,” says Burke.

“This sit-and-wait lifestyle may be a pre-adaptation for sexual cannibalism.”

This may explain why cannibalism occurs in other sit-and-wait predators such as spiders.

barbed penis

Seed beetle

A seed beetle’s penis, which has hundreds of sharp spines whose purpose is to scratch and tear the female’s reproductive organs, makes no sense at all.

After all, how does a penis gene that damages a woman’s reproductive tract spread throughout a population?

The advantages of a barbed penis for male stud beetles are obvious. Males with longer backbones tend to have more offspring. Part of the reason is that the wounds men inflict act as entry points for the nutrient-rich chemicals they produce during sex.

But from a genetic perspective, women may also benefit. In 2021, Swedish scientists have bred two strains of male stud beetles, one has long spines and the other has short spines. They then looked at what happened to the females that bred with each subgroup.

A female stag beetle that mated with a male with long spines produced sons with the same long spines. However, their daughters also appeared to have inherited some valuable traits.

On average, they were larger and produced more eggs during their lifetime.