The rainforest, a lot of zoos had birdhouses, tropical birdhouses where at one end there would be, say, the end of the building would be a square, the square end of the building would be filled with tropical plants and there’d be a guardrail and lots of live trees and some birds in free fight. And usually sometimes there may have been harp wire or very thin wire, but usually, not usually, but sometimes there was also just no barrier at all, no glass or anything, but it was darker in the public area. And the theory was the birds would not fly into the dark, although they would fly out sometimes and back in.
