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