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