But it turns out the personal finance app kept a little something in its back pocket for the full spot's reveal: Kieran Culkin is the voice behind the chatty beluga whale at the h ...

Blue Whale songs consist of an A call, a series of pulses, followed by a long, low moan called the B call. This A-B sequence is repeated over and over again, approximately once every 130 seconds.

Acoustician and lead study author Dr Salvatore Cerchio said “the sei whale songs are simply the most bizarre and unusual sounds I have ever heard from a whale. They are entirely other worldly.” ...