In late February I am travlling to India on a holiday. One of the things I will be doing is visiting the Ranthambore National Park in Rajasthan. This is one of the worlds best Tiger habitats. I am very new to photography and was wondering what lens would be best to take along. I intend to hire one before I leave if needed rather than buy at this point. My camera is a Canon 60D and I have a Sigma 18-200mm lens already.

Cheers
Dave