I am less active these days with birding & photography but I really do love birds.
This is probably the picture of mine I'm most proud of in terms of birds. Wild Barred Owl... IIRC this was my old Canon 5D + 300mm f/4 lens + 1.4x Tele Converter. I am way more proud of actually spotting the damn thing. My wife and I were snowshoeing and we spotted this owl. In our area you hear them constantly but they are incredibly hard to spot. We have a pretty large print of this (12"x18" matted & framed) in our living room and it gets a lot of compliments.
This one is not technically great.. exposure could be better, but I've always been psyched about this one because it's so rare to spot Swans in the air and I got the shot at all.. this thing came flying by me very fast and it was a huge surprise so I was psyched I even got it in the frame & in focus. This one was with just the 300mm lens I think and it was with my current 5D Mark III. This Swan came by me really close... it was like getting buzzed by a small airplane.
I do have a few more I'm really proud of.
Where I work I constantly spot Great Blue Herons and Red Tailed Hawks from my windows.