I couldn't resist.
For whatever reason- that song, as well as "Tears in Heaven" makes him whistle.
We've had Mohawk about 3 months, and it's been slow-going getting him used to us/hands etc. But I think he's coming around.
You can actually hear him whistle the beginning of "If You're Happy and You Know It" at 1:28 and 2:56!! We've been working on that one a while.
Cheers!
It is strange but I sat on my balcony ones and played a bit blackbird and a Merle was whistling back,,,maybe they love the song