But dinosaurs had more to worry about than other dinos. In India, fossil hunters came across a dinosaur nest full of sauropod eggs. Sauropods were the famous "long-necks," the biggest land animals ever to crush the planet underfoot, and adults were as untouchable to predators as elephants are today. But as tiny 20-inch hatchlings, these would-be giants made easy snacks for all sorts of prehistoric monstrosities, including, in this case, snakes:

Wilson et al, PLoS Biology

If you're thinking that looks more like a fossilized dino turd than a snake, here it is seen through Science's patented Fossil-o-Scope:

Wilson et al, PLoS Biology
Take note of Littlefoot's stubby arms pleading for mercy.

And if that's still not clear enough, here's a full 3D sculpt of the horrific scene:

Ximena Erickson and Bonnie Miljour; sculpture by Tyler Keillor
Snakes haven't evolved much since the age of dinosaurs. No need to change once you've perfected the art of being terrifying.

A mudslide interrupted the snake before it could gulp down the infant, meaning it's really only guilty of attempted baby dino murder.

In 1962, a surveyor working on a Nebraska range discovered some gigantic bones sticking out of the ground. The Dinosaur Police were called to the scene, and they found the skeleton of a 12,000-year-old mammoth. At first it was all standard procedure, but as the investigators kept digging, they noticed that something was a little off. Namely, that the mammoth seemed to have way too many tusks.

Bruce McIntosh via Rapid City Journal
"We're dealing with a mutant double-mammoth, or possibly some kind of land Cthulhu."

Digging deeper, they made a bizarre discovery that no one had ever seen before: The extra set of tusks belonged to a second mammoth, and the two had died with their tusks tangled up around each other's heads.

The detectives had an idea about how these behemoths might have ended up in such an awkward position: Males of modern animals such as elephants, moose, and frat-house jackasses often engage in savage head-butting contests to impress women, and they reasoned that these mammoths had (literally) joined in battle the same way. But they couldn't prove their hypothesis until 40 years later, when they ran the skeletons through a battery of modern tests.

Phil Hore/Bone Rooms
"Our core samples show conclusively that they were attempting to combine into a Megazord."

Dental exams revealed that the mammoths were both mature enough to enter their seasonal hormone rage, and that they died during the time of year when their murder-boners were pulsing at full power. After getting their faces tied up in a ridiculous knot, they fell and pinned each other down, exhausting themselves in their desperate struggle to escape.

Phil Hore/Bone Rooms
Believe it or not, this painting isn't on the side of a van.

It was a truly grueling death for our two hormone-fueled mammoth teenagers, but as miserable as it sounds, they were still probably better off than the wolf they squished as they went down.

The site is now the Ashfall Fossil Beds State Park, and they're still digging up victims over 40 years after the initial discovery, including long-extinct oddities like giraffe-necked camels and saber-toothed deer. New finds are constantly uncovered and left in position so that anyone can take a joyous stroll through the park to witness Mother Nature's grim panorama of despair.

Here we have an orb-weaver spider bearing down on a wasp caught in its web, and even after 100 million years the silky web strands are still intact. Today, this type of wasp is a parasite known for injecting its larvae into spider eggs. So either the wasps were already hijacking spider eggs way back in the dino days and this fellow just happened to get caught in the act, or his descendants started a wanton campaign for vengeance, slaughtering unborn spiders to redeem the species' honor.

Baby-killing wasps weren't the only creatures on the spiders' menu, though. This next petrified snapshot shows a female spider devouring her own mate in a fit of coital munchies:

Fossil Mail
Don't knock getting devoured while having sex until you've tried it!

But perhaps even more unlucky than the lady spider's mate/appetizer is the poor bastard of a beetle who was trapped nearby, presumably while sitting very, very still and keeping very, very quiet:

Fossil Mail
... and masturbating furiously.

The most chilling aspect of these pieces is that even as they were being swallowed up in gooey tree sap, the spiders clearly didn't give a single shit and kept right on with their grisly business, thus proving that these eight-legged hell-creatures have been dedicated to keeping terror alive since the beginning of time.

You know what's missing from our comprehensive archive of kickass fossil scenes? Disturbing dead animal pornography.

Dr. Diying Huang via NBC News
Jurassic flies, boning. And now, our amazing journey through prehistory is complete.

Every single animal living on the planet right now is the product of tens of millions of generations playing vigorous sessions of groin-tag. With those numbers, it stands to reason that sometime, somewhere, somehow, a happily humping couple would suddenly die in a compromising position, and we'd duly post their humiliating pictures on the Internet. Here's a pair of turtles who died of asphyxiation while having sex:

Naturmuseum Senckenberg via LiveScience
These aren't actually fossils. Turtles are just a bit slow to finish is all.

Trilobites were the dominant life forms of the Paleozoic seas, and they certainly didn't rise to such incredible numbers without stripping off their shells and engaging in vast, slithering, naked orgies:

University of Cincinnati
If there wasn't already a bizarre "-philia" for this kind of thing, we probably just inspired one.

So out of all these fucking fossils, which one takes the crown as the definitive voyeuristic glimpse of the sex that time forgot? To answer this question, we turn to Dorion Sagan, son of "The" Carl Sagan, who waxes erotic on the world's first recorded ejaculation in his book Death and Sex:

Brain Pickings
Wait, is your mom in the room? Keep scrolling, keep scrolling!

"Another sample of rock, sliced thin and observed with a microscope, shows Aglaophyton's antheridium, its male sex organ -- filled with sperm cells ready to explode. Here, preserved by chance, with neither compromised actors nor moral qualm, is a geographic equivalent of the 'money shot' of pornographic films -- an ejaculation event 140,000 times older than Homer's Odyssey, 400 times older than the human species, and almost as old as the appearance of animals in the fossil record."

We couldn't possibly have put it any better than Mr. Sagan, so we'll just add this single word in closing: ew.

Mr. Yee plans to leave behind an epic fossil when he dies. In the meantime, he writes the Internet's largest daily fortune cookie and sells awesome T-shirts.

Related Reading: Some prehistoric monsters are still around, like the lamprey (AKA condom full of teeth). For a look at the weird directions human evolution could have taken, read this article and learn about our Hobbit cousins. And did you know the Loch Ness monster might have been a Plesiosaur? It makes sense.