If you ensure that you select a brand that uses mesh the measures to be under ¾ of an inch, it will be safe for birds. Problems that arise with these products is when the mesh is just a little bit too big, and the bird thinks that it can fit through the mesh. They will often become tangled up and can really hurt themselves. We love our backyard birds, and we don’t want to see them get hurt! That’s why it is important that you make sure that you never use a mesh that measures over ¾ of an inch to ensure that they will all live to sing to you another day.