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.
Bombus pensylvanicus - Wikipedia
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Beyond honey bees: Wild bees are also key pollinators, and some species are disappearing
Images — Department of Entomology
One of the most common North American bumble bee species is actually two species — News — Department of Entomology, Bumble Bee
Bumblebees
Images — Department of Entomology
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American bumblebee could be officially declared endangered