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