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