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The seasons are changing as the planet warms. Some migratory species may break under the strain—but others could surprise us.
Researchers today can follow birds' paths as they fly thousands of miles. But it wasn't always that way. Scroll through more than two centuries of advances in understanding this natural wonder.
United States Christmas Bird Counts reported 664 species, eight Count Week (CW) species, 69 infraspecific forms (forms), and 40 exotics. The
During the 121st Christmas Bird Count (CBC) in Canada, counts reported 284 species, a decrease of five species from last year.