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