C&C per req:

1. Nicely captured. A bit of lens flare by the look of it, and a shame about the blown sky, but I really like the way the light is highlighting his main (and I don't like highlights too often).

2. This is an excellent capture. I love the "Oh geezz... another day at the office" look on her face. I'm not sure if I like the way this image is cropped or not however; I don't think the long/low aspect works. I also think that the lioness could stand to be just a little bit darker.

3. Too many birds and too little focus I'm afraid. The only one who is really in focus is beak-on to the camera and hard to see. This image needed much greater DoF to really capture it. Be aware of things such as the leaves protruding into the frame image right and foreground and don't forget to level your horizons.

4. For a handheld capture this came out very well. It's a little dark, but that's easily adjusted in post. Next time, bring a tripod, and try exposures in the 2.5 - 3 second range for a super-smooth, 'feathery' effect.

Overall, very well done. I've noted a few issues that I see, and I fully understand the limits of photographing in a zoo (Essentially take what you get) but some of the thoughts here can be applied to other images as well.

Just my $00.02 worth - your milage may vary.

~John