"'Beluga' I say. 'A small whale'"
Beluga
Creative Commons AttributionBeluga - Credit: jessi.bryan, Flickr

 The Beluga (or white whale) is a marine mammal which inhabits Arctic and sub-Arctic waters. Beluga rarely exceed five metres in length (not a lot for a whale).  They have a distinctive all-white colouring. They are commonly called sea canaries due to their unmistakeable high-pitched twitter.

Beluga are classified as Endangered, according to the IUCN, and in some regions (e.g. Alaska) are critically endangered.