Hi I think you are going to find it's more about the lenses than the camera.
Practically any recent dslr will give you good results.
I have been shooting digital over 10 years and have only upgraded bodies twice since then.
started with Canon 10D progressed to 40D and now using 5DmkIII.
however I am still using some of the lenses I started out with which are 10 years old and still great lenses by todays standards.
I bought some real crap lenses when I started over 25 years ago!
I suppose doing the macro shots is not too bad as you can pick up a reasonably priced macro lens either new or second hand or even use a decent short prime or zoom with extension tubes.
Shooting BIrds, particularly in flight is a bit more of a challenge as ideally you will need probably a least 300mm preferbly 400 with decent A.F
500-600 lenses are great if you can afford them.
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