South-east Arizona/Sonoran

I am from Cali but I couldn't find a forum for other southwest regions so I thought I'd ask the question here. I am strapped for cash at the moment so am unable to fly out of the country, but I have heard that the very far southern reaches of Arizona contain sizable populations of wildlife and very different ecosystems than the rest of the state. Is this true? I've even heard that Jaguars can be spotted in the northern reaches of the Sonoran desert. Anyway, if anyone has any information I'd love to know. Thanks