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