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