Dude I shoot black bear with a 100-400IS on a 1D..... you do not want , nor do you need a POS 650-1300 junker lens.

invest in a 300, 400, 500 lens(even a zoom) and a GOOD tripod .

the canon 300f4IS, 400F5.6L, 100-400IS, SIGMA 50-500 will do you FINE with PROPER wildlife TECHNIQUE ;)

http://www.camerahunter.com/tips1.html