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a dark-colored bee is viewed from behind in mid-flight, close to a concrete surface. the bees wings appear as only a blur.

What makes a non-native species “invasive”? And can a typically beneficial insect like a bee be deemed a threat to native species? Researchers explore these questions in a new review of the expansion of the non-native mason bee Osmia taurus since its U.S. arrival in 2002 and its effects on closely related native species. (Photo by Margarita López-Uribe, Ph.D.)

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