We, the general public, don't know as much about bumble bees as we do honey bees. Honey bees, the Kardashians of the bee world, get all the press. It's highly possible some species have gone extinct or are in danger and we don't even know it.
There is going to be a researcher do a presentation, in Kansas City, in a couple of weeks. He has studied native bees in the KC area and St. Louis. I hope to be able to attend. It's a very busy time at work, but I have my fingers crossed.