Get smart curated videos delivered to your inbox.   SUBSCRIBE
The Kid Should See This

Hermit crabs line up to exchange their shells

There’s an extraordinary sight in this clip from the BBC’s Life Story, narrated by Sir David Attenborough: A line of hermit crabs self-arranges from smallest to largest. They’re ready and waiting to exchange their shells—but why? Attenborough explains that “as a crab grows its shell becomes an ever-tighter fit so eventually the crabs need to move into a bigger one.” And so these small decapod crustaceans have organized, hopefully ensuring that each one will quickly find and move into a slightly larger mobile home.

hermit crabs in a line
hermit crabs exchange shells
Related videos: Pagurus Bernhardus changes its shell, a Caribbean hermit crab named Godzilla, a Caribbean hermit crab mass migration, and more videos about crabs.

Also: A molting Japanese spider crab time lapse.

This Webby award-winning video collection exists to help teachers, librarians, and families spark kid wonder and curiosity. TKSST features smarter, more meaningful content than what's usually served up by YouTube's algorithms, and amplifies the creators who make that content.

Curated, kid-friendly, independently-published. Support this mission by becoming a sustaining member today.

🌈 Watch these videos next...

The Naked Mole Rat – Natural Curiosities

Rion Nakaya

Honey Badger Houdini

Rion Nakaya

Under The Dock, a marine life series by Hakai Institute

Rion Nakaya

Seashell inspiration: Growing cement bricks with bacteria

Rion Nakaya

Planet-changing ‘invisible’ microbes on the deep sea floor

Rion Nakaya

How do filmmakers get such amazing footage of birds flying?

Rion Nakaya

Crab Story

Rion Nakaya

Undersea Adventures, a science experiment

Rion Nakaya

Molting Japanese spider crab time lapse – Enoshima Aquarium

Rion Nakaya