Up Next
These Animals May Sting You, Spray You With Stinky Fluid or Explode In Your Face
Season 13
Episode 4
14:46
Back to Show
Deep Look
Here’s Why Humans Can’t Lay Eggs
Season 12
Episode 20
Why do most animals lay eggs, while humans and most mammals give birth to live young? In this episode of Big Ideas from the team behind Deep Look, host Niba explores how eggs first evolved, how they helped animals conquer life on land, and why most mammals eventually shifted from laying eggs to growing babies inside their bodies.
Support Provided By
5:14
Ladybugs may be the cutest insects around, but they don't start off that way.
3:57
Do cockroaches -- daring, disgusting disease vectors -- have anything at all to offer us?
5:42
Covered in a shiny bubble, the alkali fly scuba dives in California's Mono Lake.
4:58
A “bee fly” is a freeloader that takes advantage of a bindweed turret bee’s hard work.
4:05
The scaled wormsnail cements its shell to a rock and snags its meals using mucus!
4:04
Step right up to see tiny springtails spin through the air with the greatest of ease!
3:44
Geckos navigate nearly any surface with an electron dance at the atomic scale.
3:22
Bird’s nest fungi look just like a tiny bird's nest. But those little eggs have no yolks.
3:36
How are frogs so amazing at catching bugs? It’s their supersoft tongue and special spit.
4:00
Mussels create byssal threads to attach themselves to rocks and each other.
4:10
Earthworms cozy up with a mate inside tubes of slime to make cocoons full of baby worms.