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