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