Just about anywhere you look, there are birds. Penguins live in Antarctica, ptarmigan in the Arctic Circle. Rüppell’s vultures soar higher than Mt. Everest. Emperor penguins dive deeper than 1,800 ...

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Birds are a barometer of the health of water sources, habitats, and air quality. A notable example is the use of canaries in coal mines during the 20th century to detect unsafe carbon monoxide levels ...