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