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