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