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