Heather, welcome also:


I think you have made some excellent selections in the 24-105 F4L IS and the 100-400 F4.5-5.6L. I have the 24-105 and it's superb for a general purpose walkaround lens. With an XT, it's not so wide at the bottom end but probably won't be a big deal for your application. I don't have a 100-400 but a lot of the forum members swear by it and it should be ideal for wildlife shooting.


If you think you may need something wider at the low end, the 17-40 F4L is also a great lens. You just have to fill the gap between 40mm and 100mm in that case.