A sky island is a mountain that is situated in isolation within an area of lowlands where the environment contrasts greatly to the environment of the uplands of the mountain. Instead of being surrounded by water they are surrounded by low lying land. In a location such as this the environment changes dramatically from the lowlands to the mountain summit. This results in significant differences evolving in the natural habitat of both lowlands and uplands regions of the mountain.
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"Sky islands", Santa Catalina Mountains,
Arizona, USA. - Public Domain
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In such places it is not unusual to find species of fauna or flora that are limited to a certain altitudes. Such species of animals and birds may practice vertical migration up or down the mountain as the weather and seasons change in order to find food or shelter. Read more
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