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