I was reading about the mess some parrots make by flinging food out of
their cages. I noticed in Bird Talk that there are aprons you can fit
at the bottom of cages to catch some of the spillage and seed husks
and stuff. I thought though, that aprons wouldn't be of much help
if you had a bird who enjoys throwing food out of the cage, since
the bird could possibly fling the food out far enough to miss the
apron.
I thought of a solution to that problem that is cheap and easy. You
can buy sheets of plexiglass from lumber yards in various sizes that
could form a shield and fit up against the cage apron. Use piano
hinges to connect all four sheets. You can cut the sheets to the
dimensions of the apron for a tight fit. Leave one corner unhinged to
act as a "door" so that you can reach the cage. Since the stuff is
transparent, the bird can still see you and you can see it.
I wouldn't try to use this stuff directly against the cage though...
it's easy to cut and a parrot can easily start chewing through 
it if it can reach it with its beak. I don't think it's toxic but I
would be concerned if a parrot started eating the stuff. The cage
apron is probably far enough away from the cage grating that the
bird can't reach it...but you will have to check that yourself.
I use the stuff here to substitute for a "glass" counter top in my
amateur radio station. I put lists of codes and frequencies underneath
it for fast reference. People also use this stuff to make terrariums for
lizards and and turtles. It can't shatter, so it's safer than glass.
I plan to try this if I wind up buying a parrot that turns into a flinger.
It should work...
... I'm tired of choosing taglines. Put one of your's in here...  
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