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