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