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