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At-Risk Bumble Bees

A fuzzy bumble bee clings to pale purple flowers.
The endangered rusty patched bumble bee (Bombus affinis). (Photo: Xerces Society / Sarina Jepsen)

While all pollinators are facing significant threats, an analysis led by the Xerces Society, and coordinated with the IUCN North American Bumble Bee Specialist Group, indicates that more than one-quarter of North American bumble bees are facing some degree of extinction risk. Read the profiles below to learn more about these important, and imperiled, pollinators.

Name search (partial name okay)
Bombus pennsylvanicus
American Bumble Bee
USA: AL, AZ, AR, CA, CO, CT, DE, FL, GA, IL, IN, IA, KS, KY, LA, ME, MD, MA, MI, MN, MS, MO, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OK, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WV, WI, WY
Canada: AB, ON, QC
Bombus crotchii
Crotch's Bumble Bee
USA: CA, NV
Bombus franklini
Franklin's Bumble Bee
USA: CA, OR
Bombus morrisoni
Morrison Bumble Bee
USA: AZ, CA, CO, ID, KS, NV, NM, OK, OR, SD, TX, UT, WA, WY
Canada: BC
Bombus caliginosus
Obscure Bumble Bee
USA: CA, OR, WA
Canada: BC
Bombus affinis
Rusty Patched Bumble Bee
USA: CT, DE, GA, IL, IN, IA, KY, ME, MD, MA, MI, MN, NH, NJ, NY, NC, ND, OH, PA, SC, SD, TN, VT, VA, WV, WI
Canada: ON, QC
Bombus fraternus
Southern Plains Bumble Bee
USA: AL, AR, CO, FL, GA, IL, IN, IA, KS, LA, MA, MN, MS, MO, NE, NJ, NM, NC, ND, OH, OK, SC, SD, TN, TX, VA
Bombus occidentalis
Western Bumble Bee
USA: AK, AZ, CA, CO, ID, MT, NE, NM, ND, OR, SD, UT, WA, WY
Canada: AB, BC, SK, YT
Bombus terricola
Yellow Banded Bumble Bee
USA: CT, IL, KY, ME, MD, MA, MI, MN, MT, NH, NY, NC, ND, OH, PA, RI, SC, SD, TN, VT, VA, WV, WI
Canada: AB, NB, NL, NS, ON, QC, SK
Bombus fervidus
Yellow Bumble Bee
USA: AL, AK, AZ, CA, CO, CT, DE, FL, GA, ID, IL, IN, IA, KS, KY, ME, MD, MA, MI, MN, MT, NE, NV, NH, NJ, NM, NY, NC, ND, OH, OR, PA, RI, SC, SD, TN, TX, UT, VT, VA, WA, WV, WI, WY
Canada: AB, BC, MB, NB, NS, PE, ON, QC, SK