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