That's a MOCKINGBIRD.
The Big Bang Theory Season 5, Episode 17
(MOCKINGBIRD whistling)
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