Stick to the 500mm lens, (I assume it's a Nikon or Sigma lens?) and attach a 1.4 Nikon or Sigma converter, that will give you either a 750mm (without converter) or a 1050mm (with converter). You will lose just one f stop with this combination. A 1050mm lens is more than adequate for any wildlife, it will require substantial support and good light in order to use it effectively. If you need to be closer than this combination allows, then I think a brush up on field craft or the use of an hide is in order!
nirofo.
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