I have a Canon T2i Rebel and we're visiting Yellowstone and Grand Teton for a few days. I would like to take some great photos of the wide vistas and the mountains, but I'd also like to capture some of the animals. I have these lenses:
Canon EF 50mm f/1.8 II
Canon EF-S 55-250mm f/4.0-5.6 IS
Canon EF-S 18-55mm f/3.5-5.6 IS

I was thinking about renting an EF 400mm f/5.6L USM lens and maybe a Canon EF-S 10-22mm f/3.5-4.5 USM.

I don't want to carry all of it. Any ideas on what exactly I should take?

Thanks!