An insect-eating bird is a type of bird that feeds on insects as its primary source of food. The gnatcatcher, which has 11 letters, is a small insectivorous bird found in North and South America. The TITMOUSE, with 8 letters, is a small songbird found in North America and Eurasia. Lastly, the vireo, with 5 letters, is a small passerine bird found in North and South America. All three of these birds are insect-eating birds.