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