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