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