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