The long lenses take a bit of practice to handhold steadily, especially when tracking a flying bird. Some people find it easier with a monopod and ballhead.
Personally I prefer handholding my 500mm f4.5 and 120-300 f2.8 lenses, but you do know you have been carrying some weight after a while.
As Mike said, a short telephoto for the small wildlife, and a macro lens or wide angle for the rapeseed would be my most likely choice of hardwear. (I have had some interesting results with wide angle zooms on extension tubes - quite good for flower photography, but tricky with focal plane and depth of field.)
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