Chapter 1
The spiky anatomy of a living pin cushion
Chapter 2
The great kelp forest battle
Chapter 3
From tidepools to science labs and dinner plates
YOUR GOAL
Master of The secret life of the purple sea urchin
Ch 1 · The spiky anatomy of a living pin cushion
sonia Purple Sea Urchin
I don't need eyes because my tiny tube feet see everything around me!
sonia A complex five-toothed structure called Aristotle's lantern allows urchins to scrape tough food from rocks.
sonia Lacking actual eyes, purple sea urchins use their entire spiky body to detect light and shadows.
BETA
sonia Guide the purple urchin through kelp forests to learn how they impact ocean ecosystems.
Fun Fact
Aristotle's lantern: The sea urchin's complex chewing mechanism was named by the famous Greek philosopher Aristotle in 343 BC!
Glossary
test (noun)
The rigid, shell-like outer skeleton of certain invertebrate animals, especially sea urchins. The purple sea urchin's spherical test is made of interlocking plates that grow alongside the animal.
The rigid, shell-like outer skeleton of certain invertebrate animals, especially sea urchins. The purple sea urchin's spherical test is made of interlocking plates that grow alongside the animal.