I agree, that's not going to work for containment of any bird, they are too stupid to know the difference and will go right threw it. It works well for keeping out predators, but they still get threw every now and then. Get ya some chicken wire, 2 inch, fence it in, put 2 strands around the bottom, one at 6-8 inches the other about 10-12 inches above that, that gets the diggers, and the chewers.
Now I always run it here, but use 6 inch insulators to keep it away from the birds, as I have had pheasants, touch it(back in the day) and fall over dead, just another reason why this will not work for bird containment (yes low power "pet safe" chargers too) Speaking of which, they don't work worth a Darn for predators either, you have to have the full strength cattle chargers for long hair critters like fox, coyotes and coons. Also, depending on what you have, they can still half way fly or flip even with clipped wings