Trivia: Which of these birds does NOT nest in the saguaro cactus?
Gila woodpecker
Red-tailed hawk
Screech owl
Common loon
The correct answer is Common loon
So why is this answer correct? : Like other plants, cacti are vital to the animal ecosystems in which they thrive. For example, gila woodpeckers will excavate cavities in saguaros for nesting. Once evacuated, larger species such as red-tailed hawks or screech owls will use the plants for nesting or hunting platforms. The Sonoran Desert is too warm for common loons, which prefer coastlines and chillier climates.