Thanks for the comments. The zoo has some exhibits where there are no fences to keep the animals in. The tiger and the gorilla were behind glass, so the trick was to find an angle where there were no reflections or get close to the glass. The cheetahs were begind a chain link fence and the owl and vulture were inside a wire cage. So the trick there was to set the lens aperture to f 2.8, get as close to the fence or cage and then zoom in to frame. With a long enough focal length, the depth of field is such that the fence/cage just blurs away as if it was invisible.
The camera gear I used was a Canon Digital Rebel with 70-200mm F2.8L lens. I shot at as low an iso as I could get and keep the shutter at at least 1/60 second. A couple pictures of a frog and lizard in a really dark room came out fairly clean even at iso 1600.
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