I have seen dragonflies around the hives as well. Sometimes they try to get a bee, but they don't catch them. I've noticed that other flying insects seem to be attracted to the area, perhaps those are what thte dragonflies are after.
Regardless, it seems that your population of bees would not be affected.
A month ago I looked up dragon flies and it seems they love mosquitoes. I did not see where they ate bees but I did not look. Anyway as bad as the mosquitoes are around here they can have a few bees as long as they keep the mosquitoes down. I have to have the bee suit on not for the bees but the mosquitoes because they are so thick.
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