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