Works for large birds, IF...
We have a Blue and Gold Macaw. For years we used the Lixit Quick-Lock plastic bowls for his cage. The lock kept him from flipping or throwing the bowls, but a few months of his rough treatment would eventually break the little lock tab off. So, we'd buy a new one and add the old one to the growing stack of broken ones.
I decided to try the steel coop cups (20 oz.), because they were more durable and easier to clean (and cheaper!). My wife warned he would flip the bowls out of the ring holders and make a mess. I ordered them, anyway. She was right, of course. But I tried to figure a way to secure them. Something easy, that wouldn't make changing bowls a minor ordeal. I happened on an easy solution that worked perfectly! I use the little metal clips that come on bags of coffee beans, only one needed per bowl/ring. The ends have a little bend that grabs the ring and bowl rim, and prevents the bowl from flipping - oh, how he tried. They're easy to remove and replace, yet the bird can't quite get them off (again, he tried). I bought these bowls 3 years ago. They are still going strong!
Reviewed by: Brian D from Rowlett, Texas.