Sea urchins are essentially folded-up sea stars. Very poky folded-up sea stars with spikes poky enough that even I might consider putting some shoes on my feet. Maybe.

👀 Read the article (+ references): https://katehildenbrand.com/sea-urchins/ 👀

HAPTERS: 00:00 Introduction 00:10 Sea urchin basics 01:25 How sea urchins move 02:16 Seeing with their feet?! 02:29 The many mouths of destruction 03:42 How urchins do it 04:12 Light pollution vs. the moon 04:32 Pencil urchins 05:00 Dead things as decoration pt. I 05:26 Sand dollars 05:52 Walking on spikes? 06:55 Urchins and kelp forests 07:48 The heroes fighting for kelp 09:06 The otters need our help

FOOTAGE: Shazaad Kasmani: How Do Sea Urchins Walk https://www.youtube.com/watch?v=PlsxpTXHKVo

Jay Cee Max: I Saved Its Life, then Look at what this Sand Dollar Does in Return! (Amazing) https://www.youtube.com/watch?v=e2cBLm0XrMY

Addictive Reef Keeping: Pencil Urchin https://www.youtube.com/shorts/a2zfoLphkKU

Deep Marine Scenes: Facts: The Sea Urchin https://www.youtube.com/watch?v=K4-DD265LQk

Nick DiGiovanni: Live Sea Urchin https://www.youtube.com/shorts/Vh9ZrAHeE2I

YBS Youngbloods: GIANT SEA URCHIN Catch And Cook - Ep 149 https://www.youtube.com/watch?v=Vzkr9VwExNk

Shellcade Shelling Down Under: Giant sea urchin! https://www.youtube.com/shorts/LuJV1yc1tQI

BBC Earth: Army of Sea Urchins? | Planet Earth https://www.youtube.com/watch?v=ihvKwVDw8Pc

Deep Look: Sea Urchins Pull Themselves Inside Out to be Reborn https://www.youtube.com/watch?v=ak2xqH5h0YY

Sally McGrouther: Sea Urchin - Righting Behaviour https://www.youtube.com/watch?v=_-spf6ZB8wI

Achim Paululat: Green sea urchin (Psammechinus miliaris) - Pedicellariae and Ambulacralfeet in action https://www.youtube.com/watch?v=6XO64eZFm_g

oh worm!: Sea Urchin Dissection || Aristotle's Lantern https://www.youtube.com/watch?v=KuGJ2UwG7dw

PNJ Beach Life: Sea Urchin Spawning https://www.youtube.com/watch?v=SwzgsNpI7_g

Waterline: Close up of a Ha'uku'uku'ula'ula, or red pencil urchin. https://www.youtube.com/shorts/PXOQIQmEtfA

BEHIND THE BLIND: SHED ANTLER WALL!! https://www.youtube.com/watch?v=r8N4L47EJiQ

Deep Marine Scenes: Facts: The Sand Dollar https://www.youtube.com/watch?v=DOEdJrFe9gY

Deep Look: A Sand Dollar's Breakfast is Totally Metal | Deep Look https://www.youtube.com/watch?v=dxZdBPDNiF4

Sirn23: Herzigel - sea potato (Echinocardium cordatum) https://www.youtube.com/watch?v=zAtNahWeiBY

trekmate1: Sea Potato https://www.youtube.com/watch?v=2AZUth1jNnQ

The Marine Diaries: Kelp Forests: The Sequoias of the Sea https://www.youtube.com/watch?v=kzHJSJHAJ0c

Nautical Aquaventures: Feeding sea urchin to a friendly blue grouper https://www.youtube.com/shorts/RnaDi6YDE7k

Marge Brigadier: Sea Otter Eats a Sea Urchin https://www.youtube.com/watch?v=xi1iptk0QU8

Brave Wilderness: Fantastic Sea Creatures...and Where to Find Them! https://www.youtube.com/watch?v=x72LCNDRejM

National Geographic: Sunflower Seastar: Terrifying Predator? https://www.youtube.com/watch?v=BnJ8preFDdA

Mossy Earth: Sea Urchins Are Taking Over the Ocean Floor: Here is Why https://www.youtube.com/watch?v=HbBC77wgpqs

Deep Marine Scenes: Facts: The Slate Pencil Urchin https://www.youtube.com/watch?v=BzJosCOKRIE