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