Canon 1000D + Sigma 170-500
@ 350mm, 1/320, f9, ISO 400
Trust your gear you have :-
Let me assume.... you've decided to do some bird photography and simply building your lens/camera line-up. Now, you are thinking which camera/lens to buy. I would recommend to buy any popular camera system that prevail in your country/state. In doing this, you need a lot of money and if money is not your problem then you may not be interested in my saying below. If, due to restricted budget, you are taking every step cautiously and hence couldn't zeroed on what to get first- a 'pro-body' + cheap lens or a 'big telephoto prime' + entry-level body; then believe me no pro-body or a big lens will make you a great bird photographer. It's the only 'you' behind the lens/camera make you a great photographer!
So, grab a good camera and lens within your budget. It may be an entry-level DSLR or a third party zoom lens from Sigma/Tamron, like 150-500, 150-600.Some people may discourage you saying that this camera isn't capable of shooting birds in action or that lens is soft beyond 400mm etc. You may find tons of actual reviews of these popular lenses before you decide.But my view in this regard is "just trust your gear you have". If you have full faith on your gear and in your ability then you can do marvel despite some limitations.
I took these images below with a Canon 1000D + Sigma 170-500 which were considered outdated when I purchased them and learnt a lot by trial and error and from mistakes I made.
Canon 1000D Sigma 170-500 @ 300mm
1/1600, f7.1, ISO 200
Canon 1000D Sigma 170-500 @ 500mm
1/160, f8, ISO 1600
To be continued.....