Why Reindeer and Their Cousins are Total Boneheads

In a bloody, itchy process, males of the deer family grow a new set of antlers every year, use them to fend off the competition, and lose their impressive crowns when breeding season ends.

Season 4 Episode 1 Length 03:45 Premiere: 12/06/16

Recent Episodes

Release The Brood! Roly Poly Birthing Is Intense

S12 E23 Length 03:52 Premiere Date 05/12/26

Spotted Lanternflies are The Ultimate Party Crashers

S12 E22 Length 04:48 Premiere Date 04/15/26

Why Do Animals Glow? The Science of Bioluminescence

S12 E21 Length 07:26 Premiere Date 03/26/26

Here’s Why Humans Can’t Lay Eggs

S12 E20 Length 09:51 Premiere Date 03/04/26

I Simulated Insect Vision and It Got WEIRD

S12 E19 Length 10:17 Premiere Date 02/17/26

Hide! 4 Tiny Animals That Go Undercover In Style

S12 E15 Length 15:28 Premiere Date 01/22/26

Season 4 Episodes

Show Episodes

Show Clips & Previews

Praying Mantis Love is Waaay Weirder Than You Think

S4 E21 Length 04:14 Premiere Date 11/14/17

It’s a Goopy Mess When Pines and Beetles Duke it Out

S4 E20 Length 03:50 Premiere Date 10/24/17

These Whispering, Walking Bats Are Onto Something

S4 E19 Length 03:43 Premiere Date 10/10/17

There's Something Very Fishy About These Trees...

S4 E18 Length 04:10 Premiere Date 09/26/17

A Baby Dragonfly's Mouth Will Give You Nightmares

S4 E17 Length 03:01 Premiere Date 09/12/17

Daddy Longlegs Risk Life ... and Especially Limb ... to Survive

S4 E16 Length 04:04 Premiere Date 08/22/17

This Is Why Water Striders Make Terrible Lifeguards

S4 E15 Length 03:17 Premiere Date 08/01/17

Why Is The Very Hungry Caterpillar So Dang Hungry?

S4 E14 Length 04:20 Premiere Date 07/11/17

A Real Alien Invasion Is Coming to a Palm Tree Near You

S4 E13 Length 03:29 Premiere Date 06/20/17

These Fish Are All About Sex on the Beach

S4 E12 Length 03:06 Premiere Date 06/06/17

Behind the Scenes With Deep Look: The Diva Decorator Crabs

S4 E11 Length 03:20 Premiere Date 05/23/17

Decorator Crabs Make High Fashion at Low Tide

S4 E10 Length 03:15 Premiere Date 05/09/17

How Do Pelicans Survive Their Death-Defying Dives?

S4 E9 Length 03:21 Premiere Date 04/25/17

Identical Snowflakes? Scientist Ruins Winter For Everyone

S4 E8 Length 04:04 Premiere Date 04/11/17

These Fighting Fruit Flies Are Superheroes of Brain Science

S4 E7 Length 03:35 Premiere Date 03/28/17

Everything You Never Wanted to Know About Snail Sex

S4 E6 Length 03:38 Premiere Date 03/14/17

Why Does Your Cat's Tongue Feel Like Sandpaper?

S4 E5 Length 03:26 Premiere Date 02/28/17

If Your Hands Could Smell, You’d Be an Octopus

S4 E4 Length 03:12 Premiere Date 02/14/17

Archerfish Says..."I Spit in Your Face!"

S4 E3 Length 03:35 Premiere Date 01/31/17

Roly Polies Came From the Sea to Conquer the Earth

S4 E2 Length 03:29 Premiere Date 01/17/17