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