Males release clouds of sperm in the spring, with female urchins releasing anywhere from eight to 20 million eggs in the same area.
Sheephead fish eat sea urchins, as do triggerfish in tropical and subtropical seas. Both fish have giant mouths and powerful jaws that can handle sea urchins’ spines and outer shells.
You wouldn't know it from a casual glance, but a sea urchin has a mouth, lips and teeth, all located in the middle of its underside. They eat using a specialized jaw-like apparatus.
There are about 950 species of sea urchins, belonging to the echinoderm family. They are flat or globe-shaped spiky creatures that live in shallow water, rocky areas and coral reef crannies.
The whale shark is the world's largest omnivore after marine scientists' discovery that whale sharks eat plants. These massive animals are slow-moving, filter-feeding sharks and the largest known existing fish species
Diversity of bird-visible colors of hummingbirds plumages outdoes the known diversity of colors found in the plumages of all other bird species combined
The basking shark (Cetorhinus maximus) is the world’s second-largest fish next to the whale shark (Rhincodon typus).