Oh, and they also build bizarrely unappealing tubes as nests. They construct them using their feelers and a specialized set of bristles and hold them together with spider silk. Think about what that means. It means not only did evolution create a cartwheeling spider, it created mortar tubes to launch those cartwheeling spiders. No, really. Think about what that means. Right now, this very second, you live in a world that naturally creates mortar tubes for launching cartwheeling spiders.

Ingo Rechenberg
Sleep well.

The ridiculous neck-on-neck violence was captured just a few years ago by a BBC Nature and Discovery Channel production in Namibia. They followed a herd of giraffes down the Hoanib river until they finally beheld the Secret Kumite of the giraffes. As with most fights, it started over a girl. She was lanky, covered in flies, and had a 20-inch blue tongue, but in the giraffe community those are not deal breakers.

The dominant male responded to her moist, musky ovulation, but things got less sexy when a young bull interfered. Giraffes do not have celebrity-hosted mid-season replacement dating shows to pick their mates like we do, so the two suitors had to battle. And thanks to BBC Nature and the Discovery Channel hiding behind a bush and watching it, we now know giraffe ladies give up their flowers to the herd's best neck fighter. The herd's second-best neck fighter gets the consolation prize: a giraffe-patterned sack of neck bones.

The video simulation below shows just how quickly the situation can turn sour for these poor creatures. It's 47 seconds long and shows how a momentary lapse of concentration by a single inattentive ant can create a closed circle of "come this way" pheromones that sucks in every ant in the area and dooms them all.

Obviously, walking yourself to death is an objectively shitty adaptation, so why hasn't evolution put a stop to these shenanigans? The most likely answer is because who cares? An ant colony is so massive that a few hundred ants running in a circle until they die doesn't matter. It sounds barbaric, but if you've ever called Comcast, it's their exact customer service policy.

He's got some showy plumage -- a touch of shiny green in his feathers and a bright purple head, but he's a pretty unassuming bird. Get him within dick's reach of a female, though, and he goes nuts. He flutters at ludicrous speed and his courting ritual transforms himself into an unholy extraterrestrial terror, consigned by a vengeful god to requite man's sins. He looks like he's wearing a Cthulhu-themed Mardi Gras mask. No, this has not been doctored:

Nature on PBS
"TO LOOK UPON SHUB NIGGURATH IS TO KNOW ONLY MOISTNESS, GIRL."

The disturbing display is meant to close the deal romantically, because while it looks like a video game glitch to us, it's sexy as hell to a lady hummingbird. He does it by puffing out his throat feathers and angling himself just right against the sun's rays. The effect is an erotically indescribable octopus monster face. It works because a woman feels special when your face rewrites the very laws of the universe for her.

The mayflies emerge en masse -- countless horny insects desperate to live their last day to the fullest. They squirt into the sky like dirty brown waterspouts whipped up by Poseidon's furious butthole itself.

BBC

BBC
"This is going to be the greatest and only day of our liiiiiives!!!"

A tsunami of sex-crazed river bugs sounds like a worst-case scenario for a fishing trip, but it's not much better for people on shore. Like most bugs, they're drawn to light sources, so the mayflies buzz their fuckswarm directly for the nearest populated areas where they fornicate and die on every possible surface. The aftermath of a mayfly orgy looks like every diaper in the world was thrown into a wood chipper:

Reddit/fukatroll

Reddit/TrynnaFindaBalance
It's a landscape of diarrhea and corpses.

The adult mayflies' sole purpose is reproduction. They don't even have digestive systems, so once they're done boning, all they have left to do is drop dead. Each of them decorates the site of their first date with their own oozing corpse. If you wanted to live your life like a mayfly, you'd have to take a nap in a bathtub for 80 years, then rip off your skin and die having sex over the course of 32 hours. Say what you want about our human art and philosophy, but that sounds like a pretty sweet deal.

Spitting out your own glowsticks makes for a weirdly effective defense mechanism, but it's even better for impressing members of the opposite sex. These plankton-brained creatures are apparently capable of romance, and horny ostracods create patterns of light like personalized aquatic love notes. So to recap, ostracods spend their days taunting their enemies and watching them die and spend their nights making sweet love by the light of their own neon squirting. We should also mention that most of a male ostracod's body is made of sex organs and it produces unthinkably large sperm for a creature its size.

Alepoc/iStock
"I'm single, my sperm can be up to 3.6 times longer than my actual body, I'm ready to mingle."

It's disturbing a snake can swallow something as large, fast, and antlered as a deer, but even more disturbing is that they've started taking on goddamn alligators:

Nature on PBS
And winning. This is called a "Florida Pretzel."

Sometimes, both animals die in stomach-turning flesh puzzles of horror. This python body was found with a partially digested gator rupturing out of its stomach. Being killed by your own food sounds terrible, but the snake was also found without a head, so it's somehow possible its food killed it while in the process of being swallowed by eating it back? When snakes and gators battle, they create Cronenberg scenes that baffle medical science.

Sun Sentinel
This is called a "Florida Turducken."

With no resolution in sight, Florida called upon its sizable but underutilized population of gun-toting residents by hosting the Python Challenge, a state-sponsored snake-killing jamboree. Even if each of those heroic hunters turns out to be the greatest snake killer in the world, it's unlikely the problem will ever be resolved, but the state isn't out of ideas. It has introduced a number of snake detection dogs, and if they get out of hand, they simply train some gators to eat the dogs, which we already know we can control with Burmese pythons. It's what's called "The Florida Circle of Life."

Think Nana and Pop-Pop's loving 60-year monogamous relationship is quaint and old-fashioned? First off, sorry for that disturbing image, but we've got some news for you: the monogamous sexual relationship is actually brand new relative to how long humans have been around. Secondly, it's about to get worse from here: monkey sex.

On this month's live podcast, Jack O'Brien and the Cracked staff welcome Dr. Christopher Ryan, podcaster and author of 'Sex at Dawn', onto the show for a lively Valentine's Day discussion about love, sex, why our genitals are where they are, and why we're more like chimps and bonobos than you think.

Get your tickets here.

For more ways Mother Nature has a sick sense of humor, check out 6 Plants And Fungi Designed By Mother Nature (And Satan) and 7 Species That Got Screwed Over By Mother Nature.

Subscribe to our YouTube channel, and check out 6 Horrifying Videos That Prove Nature Is Trying To Kill Us, and other videos you won't see on the site!

Follow us on Facebook, and we'll follow you everywhere.