00:00You're walking through tall grass 100,000 years ago.
00:02The sun is setting.
00:03You hear something move behind you.
00:05You turn around and see two yellow eyes reflecting the last bit of daylight.
00:08A cave lion.
00:09Twice the size of any lion alive today.
00:12700 pounds of muscle, claws, and teeth.
00:14And it's looking directly at you.
00:16You have no gun.
00:16No knife.
00:17Not even a sharp stick.
00:18Your teeth are flat.
00:19Your nails are useless.
00:20You can't outrun it.
00:21You can't out-climb it.
00:22You can't fight it.
00:23So, how are you still here?
00:25How did your ancestors survive when everything on Earth was built to kill them?
00:28Let's start with what was actually hunting us.
00:31In 1924, Raymond Dart discovered a skull in South Africa that changed everything.
00:35It belonged to a child, an early human ancestor about three years old.
00:39And punctured through the eye sockets were two holes perfectly spaced to match the canine
00:43teeth of a leopard.
00:44This child was prey.
00:46Not a tragic accident.
00:47Prey.
00:48For millions of years, humans weren't hunters.
00:50We were hunted.
00:51And the predators we faced weren't just dangerous.
00:54They were apex killers that had spent millions of years evolving to hunt large mammals.
00:59Starting with the saber-toothed cat, Smilodon fatalis.
01:0311-inch canines, 600 pounds, built like a tank with a bite designed to puncture the throats
01:09of bison and camels.
01:10It didn't chase.
01:11It ambushed.
01:12It waited in tall grass or near-water sources and exploded out at 30 miles per hour.
01:17One bite to the neck and you were done.
01:18And it wasn't alone.
01:19The short-faced bear Arctodus simus, the largest mammalian land predator in North America.
01:2512 feet tall when standing, 2,000 pounds.
01:28Long legs built for endurance running.
01:30Most bears today are opportunistic.
01:32They'll eat berries, fish, whatever.
01:34The short-faced bear was a hypercarnivore.
01:36It ate meat.
01:37Only meat?
01:38And it could run 40 miles per hour.
01:40If it saw you, you were already dead.
01:42Then there were the cave hyenas, Crocutta crocutta spelea.
01:46Larger and stronger than modern hyenas with a bite force of 1,100 pounds per square inch.
01:52For context, your bite is about 162 pounds per square inch.
01:55A cave hyena could crush bones to get at the marrow inside.
01:59They hunted in packs of 20 or more.
02:01Coordinated.
02:01Relentless.
02:02And they hunted at night when early humans could barely see.
02:05Dire wolves ran in packs of 30.
02:07Cave lions were 25% larger than African lions and hunted in groups.
02:11Giant cheetahs, scimitar cats, terror birds in South America that stood 10 feet tall with
02:16beaks that could shatter skulls.
02:18Everywhere humans went, something was trying to eat us.
02:21And here's the thing.
02:22We had nothing.
02:23A chimpanzee, our closest relative, is three times stronger than an adult human.
02:27Chimps have fangs, they can climb 30 feet in seconds.
02:30And they still get killed by leopards regularly.
02:32We were slower than chimps.
02:34Weaker than chimps.
02:35We couldn't see well in the dark.
02:36We couldn't smell predators from a distance.
02:38Our hearing was mediocre, we were upright, which made us visible from far away.
02:42And our baby screamed constantly and couldn't even walk for a year.
02:45By every biological measure, we should have been extinct in 100,000 years.
02:49But we're not.
02:51They are.
02:51Every single predator I just listed is gone.
02:54And we're here.
02:55So what happened?
02:56The first weapon was fire.
02:58In Wonderwork Cave, South Africa, archaeologists found evidence of controlled fire dating back
03:03one million years.
03:04Burnt bones, ash layers, hearths, and fire changed everything.
03:08A campfire creates a safety zone roughly 30 feet in diameter.
03:12Inside that circle, predators will not enter.
03:14It's hardwired into them.
03:16Even today, lions in Africa avoid fire.
03:18It gave us light when we couldn't see.
03:20It gave us warmth and climates our hairless bodies weren't built for.
03:23But most importantly, it gave us time.
03:25Before fire, when the sun set, you found shelter and stayed completely still until morning.
03:30After fire, you had three to four extra hours every night.
03:32Time to make tools.
03:33Time to plan.
03:34Time to talk.
03:35And fire did one more thing.
03:36It let us cook.
03:37Cooked meat has more calories and is easier to digest.
03:40More calories meant we could afford to grow bigger brains.
03:43And bigger brains meant better problem solving.
03:45But fire alone didn't save us.
03:47The second weapon was endurance.
03:48We're terrible sprinters.
03:50A saber-tooth could hit 30 miles per hour in three seconds.
03:53We top out at 28 and only for a short distance.
03:56But here's what no other predator could do.
03:58Run for hours.
03:59We have something called persistence hunting.
04:01You don't chase an animal at full speed.
04:03You track it at a jog.
04:04Just fast enough to keep it moving.
04:06You follow it for three, four, six hours.
04:08The animal runs.
04:09Stops.
04:09Overheats.
04:10Runs again.
04:10It can't sweat like we can.
04:12It can't cool down while moving.
04:13Eventually, it collapses from heat stroke.
04:15And you walk up and kill it with a rock.
04:16Humans are the only species on Earth that can do this.
04:19This endurance is what drove our hunt and secured our survival.
04:22The third weapon was pattern recognition.
04:24Human brains evolved to see patterns everywhere.
04:27Broken twigs means something walked here.
04:29Disturbed dirt means something dug here.
04:32The shape of tracks tells you what animal, how big, how long ago.
04:36We started tracking predators the same way we tracked prey.
04:39We learned their schedules.
04:41Sabertooths hunt near water at dusk.
04:43Cave lions avoid fire.
04:44Short-faced bears are solitary and territorial.
04:47We observed.
04:48We remembered.
04:48We taught each other.
04:50And every generation, that knowledge compounded.
04:52But the real weapon, the one that actually saved us, was each other.
04:57In 2001, archaeologists found a skeleton in Dmanisi, Georgia, dating back 1.8 million years.
05:03It belonged to an old human ancestor who had lost all their teeth years before they died.
05:08No teeth means you can't chew meat, can't process raw food.
05:11This person survived for years after losing their teeth.
05:14Someone was feeding them, chewing food for them, or cooking it soft enough to eat.
05:18No predator does this.
05:19A lion with no teeth dies.
05:21A human with no teeth gets taken care of.
05:24In Shanidar Cave, Iraq, researchers found a Neanderthal skeleton from 60,000 years ago.
05:29He had a healed broken arm, was blind in one eye, and had severe arthritis.
05:32He lived to about 40 years old.
05:34He couldn't hunt, couldn't fight.
05:36But his group kept him alive anyway.
05:37This is what separated us.
05:39We didn't just cooperate.
05:40We cared.
05:41And we didn't just hunt in groups.
05:42We strategized.
05:43Wolves hunt in packs, but it's instinct.
05:45Humans hunt in packs with rolls.
05:46You drive the animal toward the cliff.
05:48You wait at the bottom with spears.
05:49You cut off the escape route.
05:50We used language to communicate complex plans.
05:53We threw spears from a distance, something no predator could defend against.
05:56Five humans with spears and a plan could kill a saber tooth.
05:59And we did.
06:00Around 400,000 years ago, the Schöningen spears were crafted in Germany.
06:04Wooden throwing spears.
06:06Aerodynamic.
06:07Balanced.
06:07Designed to kill from 30 feet away.
06:09We stopped running.
06:10We started hunting.
06:11And then, around 50,000 years ago, something shifted.
06:14Humans migrated out of Africa into Europe,
06:16Asia, Australia, the Americas, and everywhere we went, the megafauna started disappearing.
06:23Saber tooths went extinct 10,000 years ago.
06:25Cave lions, 14,000 years ago.
06:28Short-faced bears, 11,000 years ago.
06:30Woolly mammoths, giant sloths, terror birds, all gone.
06:34There's debate about how much humans contributed versus climate change.
06:36But the pattern is undeniable.
06:38Every continent we reached, the large predators vanished within a few thousand years.
06:42We didn't just survive them.
06:44We outlasted them.
06:45Out-thought them.
06:47Eliminated them.
06:47Because here's the truth.
06:49Evolution gave every predator one advantage.
06:52Speed.
06:52Strength.
06:53Venom.
06:53Camouflage.
06:54But, evolution gave humans adaptability.
06:56We couldn't outrun a short-faced bear, so we threw rocks at it from a distance.
07:00We couldn't out-bite a cave hyena, so we worked in groups and surrounded it.
07:04We couldn't see in the dark like a cave lion, so we made fire and turned night into day.
07:08Every biological weakness forced us to invent a solution, and those solutions compounded
07:13over thousands of generations until we became something no predator could evolve to fight.
07:17For two million years, we were prey.
07:19We hid in trees.
07:20We ran from shadows.
07:21We lost children to leopards and couldn't do anything but grieve.
07:24But we had one thing no predator had.
07:26We could learn from our mistakes and teach the next generation not to make them.
07:30And over time, that was enough.
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