In the Sierra Nevada de Santa Marta mountains of Colombia, Marcia Wiley, a glass artist from Seattle, is introducing her 12-year-old son, North, to bird-watching.
"OK, just look for something red," she says.
"That's hard to do," North says.
But not for long. "There's a quetzal on that branch," Wiley says, spotting a bird with deep-red breast plumage.
"Oh, I get it!" North exclaims. "Did you see it?"