Wolves are common to all parts of the Northern Hemisphere. They are usually shy and cautious around humans but unlike the dog, have not been domesticated at all. The most common type of wolf is the gray wolf, or timber wolf.dult grey wolves are 4 to 6.56 feet (120 to 200centimeters) long and weigh about 40 to 175 pounds (18 to 79 kilograms). Just like its name, the gray wolf typically has thick gray fur, although pure white or all black variations exist. Another common species, the red wolf, is a bit smaller.
As Bill Gates recently pointed out, that killer is the mosquito. No other species, including our own, is responsible for the loss of as many human lives each year as mosquitoes are, Gates continues. Humans murder around 475,000 other people each year. Snakes kill around 50,000, while dogs (mainly from rabies transmission) claim another 25,000 lives.
The most common vector-borne viral disease in the world, it causes an estimated 50-100 million infections and 25,000 deaths each year. Dengue Fever: Tropical Disease Hits U.S. Generally most prevalent in tropical and subtropical areas, dengue made a return to Key West, Fla., in 2009 after being absent since 1934.There were 27 known cases there last year and 18 so far this year.mail. Dengue (pronounced DEN-ghee) fever is a tropical disease spread by mosquitoes. It is caused by any one of four closely related dengue viruses -- DENV 1, DENV 2, DENV 3 or DENV 4 -- carried most often by the Aedes aegypti mosquito, and less frequently, by Aedes albopictus.