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