Which physical characteristic defines the appearance of the Belted Kingfisher's head?

Answer

A disproportionately large head topped with a shaggy, double-pointed crest

The Belted Kingfisher possesses a stocky body, a long, dagger-like bill, and a large head featuring a noticeable, shaggy, double-pointed crest.

Which physical characteristic defines the appearance of the Belted Kingfisher's head?
speciesbirdNorth Americakingfisher