Verdin nest

The Verdin builds nests for both breeding and roosting; roosting nests are much smaller. The outer stick shell is constructed mostly by the male, while the female does most of the lining.
The Verdin's roosting nests help it stay warm in winter. Winter roosting nests have thicker insulation, and may reduce energy requirements for thermoregulation by as much as 50 percent.
The Verdin builds roosting nests all year round. One pair of Verdins in Arizona was observed building 11 nests in one year.
During the heat of the desert summer, the Verdin rests quietly in the shaded interior of a shrub, sometimes panting or spreading its wings. Nests built in summer open toward prevailing winds, perhaps to aid in cooling.