I really don't understand how to mistake a bee for a yellowjacket - they look very different, and about the only thing they have in common are that they fly and

I really don't understand how to mistake a bee for a yellowjacket - they look very different, and about the only thing they have in common are that they fly and some bees have a yellowish color that does not look like the bright yellow. They sound different, they are build quite different, and they fly differently. Just observing bees on flowers for a few minutes every day in the summer and it's obvious, at least it is to me.