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