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