Hawfinch (Coccothraustes coccothraustes)

It was an early morning. My dog was demanding something by producing noises. In result I have became completely sleepless. So I took my dog for a walk at 5:00 AM and found a bunch of those birds producing noises on a nearby hornbeam tree. I grab a camera and here what is it came out with.
The sun have just started to come up. So it was quite dark unfortunately. This is why iso is so high.

Full Flickr version:

Canon 6D, Canon EF 100-400L ƒ4.5-5.6 IS USM, at 400mm, ISO2000, 1/400, ƒ/5.6