Wow, being "pretty new' to this is really an understatement. Shooting wildlife is probably the most expensive subject in photography. All the lenses will cost a pretty penny. I think you should look at something like a Tamron 200-500mm, or a Sigma of the same size, but look at ebay and buy used. The suggestion for you to look at a Canon EF 70-200mm f4, or f2.8 L with IS USM plus a 2X entender is good, but beware sinking about $2400 in lenses is pretty steep for a novice. Canon makes some good EF-S lenses in the 70-300mm range, that cost only $649.00. Tamron, and Sigma also make a quality lens for the 60d in those type of ranges. You may want to look at IS, VC, OC, these are the letter for Image stabilization for the 3 lens makers. IS does make any lens more expensive, but it takes the guess work out when shooting bird in flight (BIF). Should you buy a non IS lens, you will have to learn to shoot at high ISO, shutter speed, and watch your exposure. For shooting small animals, like squirrels, rabbits, you can use less of a lens. But, for shooting grizzly bears, you will need a really long lens. Something like a Canon EF 800 f5.6L USM, just so you don't have to get to close. Actually, you can rent almost any lens you may want for a week or two, and try it out. Look at "www.lensrental.com"
