My fave is the lion cub. Nice comp and the time of day hasn't affected it due to it being in the shade. Little crop off the top and the left side would tighten it and balance it even more in my opinion. The exp. is right on.
The giraffe is falling a little flat contrast-wise. Pump it a tad and you're there. It's a nice comp. though even in full sun.
Same with the elephant. Fine tune the contrast and it will come to life. Maybe next time you can get him barrelling towards you at full-speed a la Frans Lanting (I think he got that one - what hasn't he got?)
Nice shots.