Is this a good thing or not? They are not yellow jackets or wasps. Just good old honey bees.
bees and hummer feeders
picture did not post. Again:
It isn't harmful to the bees, but the hummers will not feed as much. It is usually an indication of a leak in your feeder. I had to use a water hose late in the evening to make the bees leave this one so I could take it down for inspection. It was slightly seeping from the seam.
The situation won't harm the hummingbirds unless you start getting bee casualties. I don't know how they got in there but I've had bees stuck in the reservoir and the bee guards.
I found in my case the issue wasn't leaking because my only leaking feeder didn't attract bees. I read something about bees and wasp being attracted to yellow so I tried switching to an all red feeder. Worked well until I discovered it was leaking onto my poor neighbors deck. Now I have a non-leaking all red plastic and glass hummingbird feeder with no bee issues.
Actually since I've switched I haven't seen one bee or wasp near the feeder and I have a wasp nest above my deck.