An aviary is a large enclosure for confining birds. An aviary is used to house birds. An aviary is a place where birds are kept, such as a building at the zoo or a bird sanctuary. If the bird is kept outside, is it safe from predators and from vectors of diseases such as sarcocystis? •. Food for the different species can be separated, with bird food placed in containers located high in the aviary – either attached to the cage wall or.