Likewise, so perhaps I'm not the best person to respond. Nevertheless...
If the backgound is bright, your subject (bird) will appear dark and therefore lacking in detail. If you open up the diaphragm by upping the F-stop, the background will be even brighter (which doesn't matter), but the subject will also be brighter, therefore showing more detail (which is what you want).
With a subject that doesn't move, the shutter speed should be roughtly the reciprocal of 1 1/2 times the focal length of the lens (ie if the focal length is 300, the shutter speed should be roughly 1/450 sec). If the subject is moving the shutter speed should obviously be a lot quicker. And, if you have a tripod, the shutter speed can be a lot slower.
Sorry, I don't know what that means
Graininess will mitigate against identification (although there are some posters here that can identify almost any bird from any pic!)
Factors that increase graininess:
- Increasing the ISO number.
- Cropping the original photo.
- Increasing the brightness of the original photo.
A doubling lens would help (it converts a 300mm lens into a 600mm lens), but you would probably need a tripod as well.
(I have a tripod, but I have not yet had time to purchase a doubling lens as suggested to me recently in this thread)
Join the club.
I hope others will correct any errors and/or add a few hints.