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Our website address: www.wildbirdsetc.com Our email address wildbird@wildbirdsetc.com
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| HELPFUL HINTS FOR SUCCESSFUL BACKYARD BIRDING- Ranges |
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The broad geographical area within which all the individuals of a bird species are found is called the range of that species. Scientists have compiled years of observation by thousands of people across the continent (many of them amateurs) to form range maps for each bird species found in North America. The boundaries of a range are the result of many factors: Birds' movements are limited by physical obstacles, such as mountain ranges or large bodies of water over which they cannot or will not fly. Climate, too, plays an important role in determining range. For example, the aridity of a desert might prove inhospitable to one species; another may not be able to with stand cold conditions. |  |
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| A bird's environment is seldom static. Ranges can shift, dwindle, or grow because of broad environmental changes, such as long-term climatic shifts or human alteration of the landscape. Ranges can also change seasonally. The needs of a bird frequently change with the season; the specialized needs of nesting and breeding are often quite different from the generalized needs of simply surviving. The habitat itself may undergo dramatic changes as the seasons progress, and these changes affect available food, water, and plant cover. |
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Therefore, a species of bird can have more than one range, depending on the season. These ranges are usually called the breeding range and the winter range. | 
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