This unsplit forked Poplar is one very special branch flute!  Or, it could be thought of as many special branch flutes in one! To begin with, the larger diameter side has a nice, purring, controlable warble on the fundamental, as heard in the first and third sound samples.  With all of the corks removed, both sides, tuned to an F minor pentatonic scale, combine to play 2 1/3 octaves.  There are many possible arrangemenst of the corks, with either side functioning as the harmony drone, making this a very versatile flute.  Measuring 21 1/2" in length, the bark has been sanded down on each side at the tone holes and at the mouth end, exposing the finely finished beauty of the Poplar wood grain, in contrast to the natural bark exterior.  A few bark  fissures have been inlaid with crushed malachite and malachite beads have been attached to the tops of each cork.  Deer lacing with malachite and brass beads holds the bird to the nest.  To help resist wet-out, both birds have been fitted with  redwood shoes, and a drain hole, covered by the lacing, has been designed into the bottom of each air chamber.   The forked branch for this flute was gathered from a storm-downed Poplar tree that grew along Discovery Lake in San Marcos, CA.