Anna/Sesame, I used to do landscaping in zoos...So I know FULL WELL the battle that a gardener can have between preserving plants and maintaining an aesthetic regarding preservation of plants versus keeping a visitor friendly experience.
Specifically, I worked with kangaroos, and as a browsing species, they were notorious for stripping bark off of trees. The solution to this wasn't too bad, as the trunks of trees could be wrapped with bamboo-wraps or wire cages in a way that wasn't too obtrusive. But I must agree, birds are the most difficult. They used to completely strip our banana trees and would reak havoc among our blooms/fruit in certain exhibits. There was only so much you could do to deter birds, without just excluding them from an exhibit space.
So Sesame, any details about your specific inquiry? I'm still waiting...
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