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However, there has been a recent scientific push to understand finer-scale effects of cities on the ecology, physiology, health, and behavior of individual animals. Most studies of urban impacts on wildlife historically have centered on censusing populations and monitoring trends in species distributions and richness.
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More than half of the world’s population now lives in cities, and rapid urbanization in the last few hundred years has dramatically altered natural habitat structure, ecosystem functioning, and faunal and floral biodiversity.