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