you have to cut the hole large enough they aren't dragging their necks over the opening but can easily stick their heads inside. I have used this waterer many times and never had any problems.I did that with my TSC duckling way back in August and one time it cut their little neck. so I am never doing that again.
But I do remember that I had a little guy who grew one ounce a day (they grow rapidly). Maybe two weeks? I just used bowls found in a thrift shop.
