Feet
Spine
Nose
Mouth
Animalia
Echinoderms
Strongylocentrotus
Purpuratus
Because the eggs make great omlettes
Because a sea urchin's egg is relatively big
Because sea urchins have large numbers of relatively big eggs
Because sea urchins have large numbers of eggs
On the beach
Subtidal area only
Intertidal area only
Both intertidal area and subtidal areas
Porcupine
Pentamerous
Dome
Toothpick
Other sea urchins
Small fish
Algae
Sea cucumbers