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