Verdin are found in the desert south west of the United States and in the northern half on Mexico. They built two types of oven nests, one for roosting and one for breeding. The nests built for roosting tend to have heaver walls and help the Verdin conserve heat in the winter nights. The brooding nests are a bit larger and thinner. The outer course stick shell is built by the males and the inner fine work is completed by the females.