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