When people see a thin black bird on the water or drying its wings on a tree branch, many can’t tell whether it is an anhinga or a cormorant. One of the easiest ways to see the difference is in ...

Body temperature in birds is regulated through their beaks. In mammals, the ears function as a heat regulator. If body temperature can’t be managed, it can mean death, the study said .

Female cardinals are orange-brown with bright beaks. Nicole Land / Audubon Photography Awards A yellow warbler in a conifer tree. Males have reddish-brown streaks on their chests.