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