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