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