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