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