The sailfish is the fastest swimmer, reaching 109 km/h (68 mph). The slowest fish is the Sea Horse, which moves along at about 0.016 km/h (0.01 mph). Dolphins can reach 60 km/h (37 mph). Of the 650 types of leeches, only the Hirudo Medicinalis is used for medical treatments. The heart of a blue whale is the size of a small car. The tongue of a blue whale is as long as an elephant. A crocodiles tongue is attached to the roof of its mouth and cannot move it The largest jellyfish ever caught measured 2,3 m (7'6") across the bell with a tentacle of 36 m (120 ft) long. The largest giant squid ever recorded was captured in the North Atlantic in 1878. It weighed 4 tons. Its tentacles measured 10 m (35 ft) long. The giant squid has the biggest eyes of any animal: its eyes measure 40 cm (16 in) in diameter. Domestic cats purr at about 26 cycles per second, the same frequency as an idling diesel engine. Sharks are immune to all known diseases. Animals also are either right-handed or left-handed. Polar bears are left-handed There are 701 types of pure breed dogs. There are about 53 million dogs in the US, and Paris is said to have more dogs than people. Some bird species, usually flightless birds, have only a lower eyelid, whereas pigeons use upper and lower lids to blink. Fish and insects do not have eyelids - their eyes are protected by a hardened lens Millions of trees are accidentally planted by squirrels who bury nuts and then forget where they hid them. There are more than 150 million sheep in Australia, a nation of 17 million people. New Zealand is home to 4 million people and 70 million sheep A cat has 32 muscles in each ear. 67. An ostrich's eye is bigger than its brain. Tigers have striped skin, not just striped fur. In most advertisements, the time displayed on a watch is 10:10. Al Capone's business card said he was a used furniture dealer. The characters Bert and Ernie on Sesame Street were named after Bert the cop and Ernie the taxi driver in Frank Capra's "It's a Wonderful Life." A dragonfly has a life span of 24 hours. A goldfish has a memory span of three seconds. A dime has 118 ridges around the edge. It's impossible to sneeze with your eyes open. The giant squid has the largest eyes in the world. In England, the Speaker of the House is not allowed to speak. The microwave was invented after a researcher walked by a radar tube and a chocolate bar melted in his pocket. The average person falls asleep in seven minutes. There are 336 dimples on a regulation golf ball. ''Stewardesses" is the longest word that is typed with only the left hand The average person's left hand does 56% of the typing. A shark is the only fish that can blink with both eyes. There are more chickens than people in the world. Two-thirds of the world's eggplant is grown in New Jersey. The longest one-syllable word in the English language is "screeched." On a Canadian two dollar bill, the flag flying over the Parliament building is an American flag. All of the clocks in the movie "Pulp Fiction" are stuck on 4:20. No word in the English language rhymes with month, orange, silver, or purple. "Dreamt" is the only English word that ends in the letters "mt". All 50 states are listed across the top of the Lincoln Memorial on the back of the $5 bill. Almonds are a member of the peach family. Winston Churchill was born in a ladies' room during a dance. Maine is the only state whose name is just one syllable. There are only four words in the English language which end in "dous"- tremendous, horrendous, stupendous, and hazardous.