That's a MOCKINGBIRD.
The Big Bang Theory Season 5, Episode 17
A MOCKINGBIRD.
Game of Thrones Season 2, Episode 1
(MOCKINGBIRD continues singing)
The Big Bang Theory Season 5, Episode 17
(MOCKINGBIRD whistles)
And you...
The Big Bang Theory Season 5, Episode 17
(MOCKINGBIRD whistling)
The Big Bang Theory Season 5, Episode 17