As Guris says, "There are not that many of us, and birding is all about identification. You'd think if they could identify thousands of birds, they could recognize us.

(Explore National Geographic's backyard bird identifier.) Why would a bird feed an entirely different species? Princeton biologist Christina Riehl has a few ideas.

(See National Geographic's backyard bird identifier.) At first researchers thought the birds were somehow interbreeding with the red-shafted northern flicker, which is lives in the West.

(Try National Geographic's online bird identifier.) A Towering Problem for Birds. Birds often hit objects in flight, especially "tall buildings in cities, or cell phone towers, ...

(Check out National Geographic’s backyard bird identifier.) Whereas people and other animals can simply move their eyes to follow an object or use peripheral vision to scan a room, owls must ...

(See National Geographic's backyard bird identifier.) "Birds are the most well-known animal class on earth, so the fact that a novel bird species can still be found on the well-explored island of ...