Beavers secrete a substance known as castoreum, which they use to keep their fur waterproof. This made them a target for medieval doctors who used it as a remedy for ulcers, fevers and even rheumatism.
From the Series: Wild Castles: Heidelburg
Published 2019-12-30 · Watch on YouTube ↗ Availability and playback restrictions are controlled by the original channel.
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