Keebs what lens did you use for the pictures of them birds. I love them and looking for a decent zoom lens to go with my first dlsr. I guess yours would be a bit out of my price range though

Hi people I'm going to purchase a CANON EOS 600D with an 18-55mm IS Lens at the weekend and I'm just wondering if anyone can recommend me with another lens. I'm mainly going to use my camera for Trophy shots for fishing, some close-ups of wildlife and finally to be able to zoom in in things like birds in trees from a distance and still get a good clear image. So what would you guys suggest as my other lens.
P.S I don't really want to spend to much on my other lens, thanks for your replies.