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