Insulated material can be used for keeping warm.
Birds waste a lot of body heat trying to keep warm in exposed areas.
Insulated material can be used to prevent wasting a lot of body heat.
insulated material can be used to prevent wasting a lot of what?

1) sunny days
2) body heat
3) body water
4) heat energy
5) contained areas
6) electricity
7) fever sweats
8) power