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