Biologists have long debated why some plants and animals can adjust to a wide range of climates, while others can't.

Nation’s grassland birds, found in 14 states, have declined 43% since 1970, more than any other category, and are currently ...

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So far North American pintail, trumpeter swans and Canada geese have been seen, as well as mallard and white-fronted geese.

Alaska is a prime location for birdwatchers. Local guides help avian observers check bristle-thighed curlews off their bucket ...