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