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