On a summer night just before sunset on the summit of Mount Mansfield, biologist Nathaniel Sharp and a crew of volunteers are getting ready to try to catch Bicknell’s thrush. “If you even give, like, ...

Look at that bird! It has patches of reddish-orange and a gray back, too. It must be an American robin — or, wait, is it? Robins are a classic sign of spring, but not all birds with patches of white, ...