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