Been reading the posts and looking at the photos. As per your question on Intergrades, the answer partly depends on who's naming system you accept. In the old system, on the East Coast, you found Black Rats, Yellow Rats, and Everglades. With the newer system, these are all morphs of the same species.
The real question might be, if you were to breed two greenish rats, would you get greenish offspring, or a mix of Blacks, Yellows and Greenish. If you were to get 100% Greenish, then it would be a stable morph and not an Intergrade.

Good question, and I know that I don't know the answer.

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