At my first AV visit, the Dr showed me a chart with five drawings of bird chests and their keel bones.

One was very underweight
One was slightly underweight
One was excellent condition
One was slightly overweight
One was obese

I was wondering if any of you know of something similar that I might find on the web?

Hmmm...we have those hanging in the vet clinic where I worked, but for dogs and cats. I'll search around to see if I can find a bird one.

edited to say: I did a quick internet search and I can't find anything at all. I'll keep looking though.