Feet
Spine
Mouth
Nose
Small fish
Sea cucumbers
Algae
Other sea urchins
Both intertidal area and subtidal areas
Intertidal area only
On the beach
Subtidal area only
Porcupine
Toothpick
Dome
Pentamerous
Purpuratus
Animalia
Echinoderms
Strongylocentrotus
Because sea urchins have large numbers of eggs
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