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