So here is my recommendation for excellent BIF. Where you can get some wall hangers.
1: Buy a pro level camera. Canon or Nikon is your best bet I think.
2: Buy a lens you can lift and not get to the point you say to hell with this. This is a lot of work. :)
3: Take a few test shots in manual to see what exposure you need to use.
4: Take your fat ass or skinny or whatever ass you have... and get a coke. Go sit down in a field where there are some birds flying around. With the morning or evening sun at your back.
5: Lift it up and as soon as you see the bird in the screen let it rip. Those cameras are so good at tracking you could track a nat in a sand storm... And I am not kidding.
So next time you see a BIF shot. If it was shot by a pro or someone with a pro camera and lens. Just say piffffff. And I am not kidding it is just that easy.
Birding is free. Get out and enjoy it. It is a great hobby.