Bee - Fuddled Blunder...

I don't normally feed the birds in the summer because I don't want to invite unwanted guests and rodents to my nesting birds territory's .My dad bought me 10 pound of birdseed,so I said "What the heck,I haven't seen much bird activity in my yard lately so why not."I fill up two birds feeders fine,but then.......I open up our biggest feeder, & remember this I haven't filled the feeders since May.I open it up and OUCH!A bee's nest with about 25 yellow jackets were under the lid of the feeder,luckily only one was fast enough to sting me on my hand once.I guess i'm not filling my feeders until the bees move out!