great pictures ions! what's the distance between you and your subjects? did you use an extender or have you cropped the images? i'm curious because a couple of weeks ago i used the lens (at 200mm) to capture a deer, but i really couldn't get close enough to get a nice shot since then i'm considering to get a 400mm f/5.6
The animals in that set were taken at a wildlife refuge in Ontario where we were allowed in the pens with them. Although they are kinda domesticated they are still technically wild animals and we had to keep a bit of distance. That said the lighter wolf passed so closely that she was too close for the MFD of the lens at one point.
And for sure, if you want to photograph animals in the wild you're going to need to go much longer unless you go to places where you can get a bit closer because they're used to people. Unfortunately I do not own this lens, the above shots were with a rental, but when I do get it, and I will, I will also pick up the 2.0 extender III for that extra reach.