Maximilian, I'm with you actually. There isn't a bird that I don't love, but we know some are just naturally not winners in the beauty contests!
The little bird (I have to try to remember there are viewers world wide) is a Black Capped Chickadee - Tit family I guess, and he/she was about 10 feet away in a little sheltered spot beneath/behind a willow tree where the beaver dam leaked enough water to form a tiny stream. i was on the dam somewhat above. The sun was breaking through and there was only one line of vision so I had no choice but to try as it was. Quite dark with lots of action so it's not the best.
6D 300 F2.8 II 2X III 800th F6.3 ISO 3200 Here's another in the sequence - not a spong bath for sure!
I had no clue when I purchased the 6D and 300 that virtually all my shooting this summer would be 300 X2 but that's what's happened. I know seasoned birders would say what would you expect, even 600 is not enough, and now I know. Never the less, that combination works so well for hand held shots. I tried tripod for a while but I guess I just love my mobility too much.