The Castorocauda was known as the "Jurassic beaver." It must have felt skittish moment to moment and day to day, surrounded as it was by much larger animals that would like to eat it.
Here, we see out little hero pursue a fish and in the process run right into a pair of hungry dinosaurs that think about the beaver what the beaver thought about the fish: "Snack!"
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Our plucky beaver lived in the Late Jurassic, about 165 million years ago. It was only about 1 foot long, but as we see it came up with a novel method of warding off its attackers. In the end, it gets what it wanted in the first place, but not without some fur-raising action along the way.