What camera and lens are you using for most of your bird pictures, Dragonspeed? I have a couple of digital SLR Nikons, (D200 & D7000) but it was going to cost over $600 for a good long lens, and for less than that I was able to purchase a Canon SX50 HS with a variable zoom up to 1200 mm. I know the quality is not up to the better SLR standards, but I have no intention of selling my photos. It's just an over saturated market. I am quite happy with the quality of pictures I get providing I have enough lighting and time to use my tripod. The added feature of excellent video that I can shoot like a Go-Pro camera is very handy for my interests. I found the video mode in the SLRs is too finicky and takes too long to set up. I get a lot of good, but out of focus video and it's frustrating.
Ian, I am a firm believer in non-multifunction devices. I use a Canon 7D with a 100-400mm for most of my bird shots. Yes, it's a bit heavy, but I find it worth it. I don't shoot video with the camera. I figure that's what video cameras are for
Others disagree, but I find the weight of the SLR is a bit much for holding up to shoot video. I do video on a small Point and shoot that does HD video. Good enough for me. If I were to get more serious about video, I MIGHT use my SLR, but then I'd also end up buying a thousand or more $$ in accessories to make it work WELL as a video camera.