Double Whistle 7th-9th century Mayan This pottery whistle is in the form of a bird standing on two legs and a tail. It is a double whistle, with two internal and separate sounding chambers. The lower chamber, located in the body of the bird, is sounded through a mouthpiece located in the tail. This chamber has a single finger hole on the front of the bird's belly allowing for two pitches to be produced. A second, smaller, chamber is found in the head of the bird and is activated through a mouthpiece protruding from behind the ears.. Double Whistle. Mayan. 7th-9th century. Pottery, paint. Pre-Columbian. Mexico. Aerophone-Whistle Flute