One of the most popular breeds of trumpeter in the U.S., the Bokhara Trumpeter is most noticeably characterized by its lengthy full muffs (feathers on the feet) and double crest which completely obscures the bird's eyes and gives it a look reminiscent of the English sheepdog. The trumpeting breeds of pigeon are so named because of their unique vocalizations which sound vaguely like low laughter. Wendell Levi describes this trumpeting vocalization in his book The Pigeon.