Leiden University’s Carel ten Cate tracked down 34-year-old duck recordings—and the man who made them—to verify that musk ducks are capable of vocal learning, an ability that hadn’t been thought to exist in waterfowl.
Watch the video, which shows a duck infected with H5N1 and showing signs of Parkinson's disease, that inspired Thomas Jefferson University researcher Richard Smeyne to explore the connection between viral infection and neurodegeneration.