Virtually blind, electric eels catch prey using electric pulses.


Electric eels have been used for


medicinal experiments, particularly in the treatment of rheumatism.


Narwhals, reaching 15 feet in


length, live farther north than any other mammal on earth.


Narwhals have a pecking order


based on which has the longest tusk. To display sexual dominance over


rivals, male narwhals will cross their tusks with other males.


Whales have two blowholes, while dolphins only have one.


The great white shark is capable


of detecting a single drop of blood in a million gallons of water.


Great white sharks can be


drowned within minutes by dragging them backward.


An individual shark species may


have only one type of teeth, such as the sand tiger with awl-like teeth in both jaws; or it may have one type in the lower jaw and another type in the upper jaw, as in requiem sharks, which have slender pointed teeth in the lower jaw and triangular bladelike teeth in the upper jaw. Furthermore, some sharks have two types of teeth within the same jaw, such as the bullhead, has pointed- cusp teeth at the front of each jaw, but molar-like teeth at the rear.


The tiger shark has been responsible


for more fatal attacks on humans than any other species of shark.


The sense of smell is so critical to


a shark that two-thirds of its brain is devoted to processing scent data.


Sharks and rays are farsighted. In many Caribbean and other


tropical waters, stingrays gather by the hundreds into seabed depressions known as ray pits.


Stingrays have strong, blunt teeth


that can crack even the hard shells of oysters.


Stingray spines have been used to


make spear tips, daggers, needles and awls.


Bottlenose dolphins can grow to 14 feet long and weigh 600 pounds.


Dolphins produce sounds in ranges


that are 10 times higher pitched than humans can hear.


The electric eel, often exceeding


six feet long, is widely eaten in South America.


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48° NORTH, NOVEMBER 2011 PAGE 21


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