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