The igil is a two-stringed instrument whose teardrop-shaped body is held between the legs and bowed like a cello. The igil is sometimes called a horse-head fiddle because the peghead of the instrument is traditionally decorated with the carved head of a horse. The unfretted strings are tuned a fifth apart and fingered very lightly, not pressed to the fingerboard. The tones of the igil are varied and rich, not unlike the sound of a cello. Bady-Dorzhu Ondar is shown playing the igil. Both igils pictured here were made by Oktober Saya.
Folktale about the origin of the igil
Hear Bady-Dorzhu Ondar play the igil [02:27] 
Watch Bady-Dorzhu Ondar play the igil on YouTube [4:59]
Igil on Wikipedia
Igil on Tyvawiki