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