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