I just saw a video of a beaver in rehab building a dam at the front door of a house. What is it about their instincts/psyche that makes them want to build dams of all things?
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One of the major reasons has to do with raising babies. Most rodents have tons of babies which grow up quickly. If some of the babies die it isn’t a big deal, since there are plenty more where that one came from. Beavers, on the other hand, have small infrequent litters, and the babies take a long time to grow to adulthood. This makes it important for the beavers to have a safe place to raise their young, which means they put a lot of effort into building their dams/nests.
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