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Q: The amount of effort that goes into a Christmas Bird Count varies quite a bit across years and count circles. How do you deal with this issue when you calculate abundance trends? How do you know ...

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The strain had previously been found only in birds and people. Most bird flu infections in dairy cattle in the US have been the B3.13 variant, or what’s become known as the “cattle clade.” ...

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Birds have many features that distinguish them from other animals alive today, but their earliest ancestors looked noticeably different from the familiar creatures we’ve come to recognise. Although ...