We have 2 also about the coloration as your 2 wablondie. One we have had about 3 years and the other about 1. The oldest one whistles the theme song from Married...with Children.
Awe, I have a pied, named TROY, she also wolf whistles, and does the "hey come here" whistle! As I was leaving the house this morning, she was attempting to escape his cage as he does often. I'll find him when I get home, my dogs love to play with him!