There are several options instead of glass (which I am sure would require an entirely different type of structure). We have 50% sun reducing screens and they make 75%. This allows air flow, but does block a significant amount of sunlight. On the sides, pull down or automatic shades are very effective. Also, there is a shade that can be hung inside the bird cage when needed to provide 100% blockage.
The design of a typical bird cage is for the support of screening (very little weight) and the associated wind load for over a 100 mph wind (think hurricane). There would be significant modifications needed for glass, also birdcages can flex, glass does not respond well to flexing. There would be a huge increase in weight, and the wind load should be much greater, IMHO, this is not a good idea.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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