Side note: We ended up adopting a 1 1/2 yr old GCC named Buddy who is AWESOME. Our son with Asperger's might not have recognized the signs that the other bird was giving about wanting to be left alone, but over the next year or two should do better at that, so we're going to wait for a large bird until then.
Okay, so here's the response from Midwest re the toxicity of a critter nation cage for future reference to anyone interested - so long as the cage meets the wire gauge requirements for their bird
Thank you for contacting Midwest regarding your inquiry. All of our products are manufactured with non-toxic materials. The paint is lead tested and does not contain zinc.