Bumble bees are disappearing due to pesticides and habitat loss. You can make a difference in your own backyard for these vital, native pollinators.
The plight of the bumblebee: several species are under threat
PDF) Conserving Bumble Bees
Beyond the Buzz
Working towards a wild pollinator strategy for Canada
Bondar - Wikipedia
Plight of the Bumble Bee - Nature Alberta
Bringing back California's wild bees — High Country News – Know the West
The plight of the bumble bee Forest Preserve District of Will County
Bee declines driven by combined stress from parasites, pesticides, and lack of flowers