[thinkmore]

females tend to have larger heads, Rook looks like a female because he is not overweight but is somewhat thick-bodied

Thanks so much!

Now, my next question. The albinos are somewhat see-through, and holding Rook up to the light, it looks like there's "something" that goes back for a short distance from the vent into the tail. What would this be?

(Scanner doesn't seem to work.)