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