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Bird Populations
Source:  https://www.ecowatch.com/cities-migrating-birds-2649952941.html?rebelltitem=5#rebelltitem5 By Frank La Sorte and Kyle Horton Millions of birds travel between their breeding and wintering grounds during spring and autumn migration, creating one of the greatest spectacles of the natural world. These journeys often span incredible distances. For example, the Blackpoll warbler, which weighs less than half an ounce, may travel up to...
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