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Bumble bees contribute to Ohio's economic success and natural resources as pollinators of crops and wildflowers. In recent years several bumble bee species have declined dramatically, including the rusty patched bumble bee (Bombus affinis), which was placed on the federal endangered species list in 2017. The primary goal of this study was to determine the distribution of B. affinis and another species of concern, B. terricola, in Ohio and to document their habitat use and food...