Google now shows random facts about animals in the "did you know" section of the Knowledge Graph card. They're extracted from various sites and Google actually links to the source.
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Some example of queries that return random facts: [cat], [lion], [tiger], [alpaca], [giraffe], [ostrich], [duck], [elk], [raccoon], [shark]. It's worth pointing out that you can get another random fact by reloading the page or searching again for the same animal.