This photograph of a cactus wren nest was taken in Sabino Canyon, just outside of Tucson.
Desert Duets: Cactus Wren Activity Web Page
Many animals and plants depend on each other for survival.
Plants provide food, nesting materials, and protection for birds and other animals. In the case of the cactus wren, the sharp thorns of the cholla protect the cactus wren's nest and help keep the fledglings safe from predators.
But how do animals help plants survive?
Conduct research to find out.
Record your research findings on a category matrix like this one.