Good flight shots can be incredibly difficult to get, soaring birds like buzzards, kites and some seagulls are great to practice on, but as its already been said, it can also be difficult to get that important detail, control the whites on the bird, especially gulls, swan etc getting the picture sharp against backgrounds like bright sky, grass, bushes etc..fast flying birds are of course always going to be that much difficut to capture, then small fast flying birds are even more difficult, diving birds are nigh on impossible except for the more experienced photographer with better equipment..a