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Originally Posted by akayerich 
well, i was pretty sure they were yellowjackets, because i didn't think there were any bees that actually live in the ground. but i just learned of a type of bee (called andrenid bees) that make their nests in the ground, and i think thats what i might have based on the description. the good news is, if they are this type of bee, the males can't sting and the females are very docile unless threatened. of course, digging up their home would probably be considered a threat. supposedly, just spraying the area with water can sometimes be enough to encourage them to leave without actually hurting them- maybe i'll try that first. i wonder if any beekeepers would even be interested in this type of bee. don't they mostly keep honeybees?
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Most of the bees that live in the ground are solitary (bumblebees being the exception - see below). If they are Andrenids or another native solitary bee, they would each have an individual hole that they go in and out of. If it's a colony with one big entrance, I'd think it's either bumblebees or some ground-nesting wasp. If you can get pictures or describe them I'd gladly help you figure out what they are. (I'm a grad student studying solitary bees, so this is my passion). Feel free to PM me!
Oh, and no, beekeepers wouldn't bother with Andrenids. They're usually only interested in honeybees, as they're easy to relocate and readily nest in bee hives. Andrenids, if you mess with their nest area, will relocate to a new spot.
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Originally Posted by greenmansions 
Subbing for ideas - we have little bumblebees nesting in the ground. They have red bums and are pretty aggressive - they stung my kids a couple of times last summer, so we'd like to get them to move somewhere else.
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Yeah, the red-bummed bumblebees can be fairly aggressive (they're usually in the group Ferrobombus, known for being some of the more aggressive bumblebees). If you know where they nested last year, you can try covering up that hole or area. Bumblebee colonies don't overwinter as a big group - they die off to just overwintering queens. You'll see big queens cruising around looking for nesting sites early in the season (when that is varies by location and when the bees typically emerge). That would be the time to make sure there aren't mouse holes or other good hiding spots for the queen to set up home in where your kids will be playing. Otherwise, if it's too late and they're already established, I'm not sure what to tell you. You can try to kill the colony by flooding it or spraying it, but then you'll lose pollinators in your area. Hope this helps!