Wolf shot is lovely - though would consider cloning out the few light strands of grass going up to his muzzle and out the top of his nose. The pose and the light on the wolf is great. You could crop some of the top of the picture above the ears as it doesn't add anything to the composition.
The bird I think is a young ostrich - I guess you went for the high viewpoint to get a plain background - but the angle doesn't work very well. I hate to quote general rules but generally photographing animals on their level works better. In this case, it makes it look (to me) like you are leaning over the bird and it thinks you're about to throttle it. However, your reflection in the eye is quite a nice touch.
The tiger cub I think was a nice moment for you and could work as part of a photostory, but on its own it is just frustrating to only see the back and not the cute tiger face.