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