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