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