One-eyed 'Cyclops' shark captured at Mexico

An albino, one-eyed shark fetus removed from a pregnant bull shark captured recently in the Sea of Cortez was one of 10 babies inside the large predator. All others were normal in color and appearance.

A story with very few details went viral during the past week, mainly because of a three-foot-long shark with a single eye perfectly centered in its head, just above the mouth.

The mother bull shark was caught on a large hook baited with ballyhoo, tethered to a line beneath a buoy fixed in place by another line anchored by a sand bag. The shark was dead when it was hauled up, long after the set was made near Cerralvo Island. It was taken ashore and filleted, a process that revealed nine normal pups and the albino, one-eyed fetus. 

Sharks are a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 420 million years ago.

Since that time, sharks have diversified into 440 species, ranging in size from the small dwarf lanternshark, Etmopterus perryi, a deep sea species of only 17 centimetres (6.7 in) in length, to the whale shark, Rhincodon typus, the largest fish, which reaches approximately 12 metres (39 ft 4 in) and which feeds only on plankton, squid, and small fish by filter feeding. 

Sharks are found in all seas and are common down to depths of 2,000 metres (6,600 ft). They generally do not live in freshwater, with a few exceptions such as the bull shark and the river shark which can live both in seawater and freshwater.They breathe through five to seven gill slits. Sharks have a covering of dermal denticles that protects their skin from damage and parasites, and improves their fluid dynamics so the shark can move faster. They have several sets of replaceable teeth.

Well-known species such as the great white shark, tiger shark, blue shark, mako shark, and the hammerhead are apex predators, at the top of the underwater food chain. Their extraordinary skills as predators fascinate and frighten humans, even as their survival is under serious threat from fishing and other human activities.