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