It is important to pick up and handle the cameras before making a decision. When I got my latest camera, a 60D, I went to the store with the aim of getting a 7D. After handling both cameras, I found that I preferred the size, weight, and ergonomics of the 60D. I had a T2i as well.
The 7D is complicated and will take some time to learn to use. The 60D is my 3rd digital SLR, and I shot 35 mm film since 1978. I started on a canon rangefinder and quickly moved to SLRs. I preferred the ergonomics and ease of use of the 60D for my uses. My hand size is medium. If I had jumbo hands, I would probably like a bigger camera.
The 7D is a sophisticated camera. You will want to use the center focus capability of it for wildlife photography. Try and figure out how to set center point AF on a 7D without the manual...