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