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