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