The Lyre-Tribe Tetrix is a group of four small owls found in western North America. These owls are called Tetrix because they have four toes on each foot. The Tetrix owls are medium to small-sized owls, with a body length of about 18 inches, a wingspan of about 34 inches and a weight of about three pounds. These owls are generally silent but can make a few notes, including a high-pitched "piiip" and a plaintive "weet". The Tetrix owls are not currently threatened but are sensitive to human disturbance and have a limited distribution.