Up Next
Back to Show
Eons
How the Squid Lost Its Shell
Season 1
Episode 38
The ancestors of modern, squishy cephalopods like the octopus and the squid all had shells. In ancient times, their shell was their greatest asset but it eventually proved to be their biggest weakness.
Support Provided By
12:08
Geologists have been able to identify crucial episodes in life’s history.
12:20
Our image of dinosaurs has been constantly changing since naturalists started studying the
5:05
Even the most ancient-looking organisms show us that evolution is always at work.
3:54
A 270-million-year-old sea creature called Helicoprion that once swam the seas.
7:36
Natural history is full of living things that were long thought to have gone extinct only
5:21
Take a close look and you might see a little bit of yourself.
4:27
Today, we’re familiar with two types of flying vertebrates -- birds and bats.