Wild bees are in decline worldwide, but their risk of extinction is challenging to assess. A multi-institution collaboration between researchers at UCSB in Ecology, Evolution, and Marine Biology, Environmental Studies, Cheadle Center for Biodiversity and Ecological Restoration and researchers at the Naturalis Biodiversity Center in the Netherlands has revealed how bee range size (where they occur) and diet breadth (what they eat) contribute to species-level vulnerability, published in the journal Insect Conservation and Diversity. Results from this study suggest that bees specializing on specific resources and occurring in small ranges are especially vulnerable to extinction risk and should be prioritized for conservation action. Taking an interdisciplinary approach led researchers to integrate information from natural history collections, field-collected samples, and global datasets to learn more about the factors influencing bee extinction risk.