Spring is advancing unevenly across North America

Spring is arriving earlier in many parts of North America, but this advance is not happening uniformly across the migration routes of many birds, according to a study by Eric Waller at the US Geological Survey in California ...

Scant amounts of DNA reveal conservation clues

The key to solving a mystery is finding the right clues. Wildlife detectives aiming to protect endangered species have long been hobbled by the near impossibility of collecting DNA samples from rare and elusive animals. Now, ...

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