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