the above guy made good suggestions on lenses. my recommendation is cheaper and likely your best option. first stick with canon lenses, they are better than most competition. Sounds like you want wide angle... your 10-18mm efs is about an equivalent ...
This is interesting. I just sold my Canon 6d mark i and upgraded to the new 5d. when i had the 6d i did not have the same issue. first of couse you needed to make sure your shutter speed was fast enough on your images, for wildlife i would make sur...