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