Readers share photos of gray bird species that live across America. Learn about the variety of gray colored birds you should ...

While some birds possess drab, plain-looking feathers, others sport brightly-colored feathers. Females typically appear less colorful than males, an adaptation that helps protect them from predators.

Back in Madera Canyon, Vazquez, Grbic, and Davis come across 38 bird species, including a Zone-tailed Hawk, a Yellow-rumped Warbler, a Dusky-capped Flycatcher, and more than 10 types of hummingbirds.