There's no better way to celebrate Halloween than by snuggling up with this mesmerizing PBS documentary, A Murder of Crows, first aired in 2010 and now available free online. We actually get to see some of the experiments that offered solid evidence that crows are breathtakingly smart tool users.

Spend an hour getting to know these amazing birds and the scientists who study them. By the end, you will have a new appreciation for the intelligence of these noisy scavengers. Sure, they eat garbage — but they also build tools to fish the garbage out of hard-to-reach crannies. Plus, they form close-knit family units and never forget a human face.

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Though this documentary is a few years old, the science in it is up-to-date and reflects current understandings of what one researcher calls "feathered apes."

Learn more on PBS.