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