The mosquito (Spanish for "little fly") is a fragile, long-legged fly of the order Diptera, family Culicidae. Over 3,500 species are known worldwide and at least 82 are found in Canada. Often considered a nuisance to humans because of their itchy bites, it is the females that feed on the blood of other animals. Both sexes feed on plant fluids such as nectar. Most of the woodland species with which Canadians are familiar belong to the genus Aedes. These species are found throughout Canada and are recognizable by their alternating white and black colour, and slender, pointed abdomens. They are present in large numbers soon after winter’s end and on spring and summer evenings. The comparatively small northern house mosquito (Culex pipiens) is commonly found indoors in early spring and late fall, and is distinguished by its size and its blunt-tipped abdomen. Canada boasts the second oldest fossilized mosquito ever found. It is preserved in 76.5–79.5 million-year-old amber from southern Alberta.