Zoo photography offers many opportunities for photographers as well as many challenges.  In most zoos, for example, a photographer can find many birds that would be virtually impossible to find without a great deal of world travel. However, while noting that your image is a "zoo location" it is still desirable to avoid fencing, buildings and in many cases people, who detract from the quality of the image. This can be done by continually watching what you see above and behind the subject.  It is far easier to reposition yourself in the zoo location then it is to try to eliminate these distractions in Photoshop after the fact. Also by getting as close and "tight" to your subject as possible you create the appropriate depth of field to blur the background.  There are many great zoo opportunities regardless of the season and equally as many photo ops.  Take your time and wait for  the right moment.  This image was taken with a Nikon D-300, 1/60, ISO 640, lens 200mm.

Larry Wilkinson