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