In tonight’s episode of the Perpetual Notion Machine, we look into pollinators, very appropriate this time of year. But, we focus on the endangered Rusty-patched bumble bee with our guest Susan Carpenter, outreach specialist and native planet gardener at the UW Arboretum. She tells PNM’s Will Cushman that about 12 species of bumble bees visit the native plants at the arboretum, but wasn’t aware of the Rusty-patched until an out-of-state nature photographer took a picture of it about six years ago. The bumble bee has disappeared from over 90% of its natural habitat range. Many reasons have contributed to its decline, including habitat loss, insecticide applied to plants, and susceptibility to disease and pathogens. Susan has been devoting a renewed effort into studying the Rusty-patched bumble bee, with the help of citizen scientists from the community.