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