One of the most common North American bumble bee species is

Bumble bees are some of our most abundant and recognizable pollinators, essential for the pollination of many native flowering plant species. As such, the diversity of bumble bees has a long history of study by both professionals and amateurs. Because of such extensive study, it is felt that new species of bumble bees are unlikely to be found. Outstanding controversies remain, however, in what comprises a given bumble bee species.

Bumble Bees of North America: An Identification Guide: Williams, Paul H., Thorp, Robbin W., Richardson, Leif L., Colla, Sheila R.: 9780691152226: Books

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One of the most common North American bumble bee species is actually two species — News — Department of Entomology, Bumble Bee