this sounds like the work of Project Mayhem

Mink Frenzy:

An animal rights group's plan to free 10,000 mink from a farm turned deadly after many of the emancipated mustelids became cannibals while others went on a carnivorous feeding frenzy. [...] Days after the break-in, starving mink attacked a menagerie of exotic birds, a flock of chickens and even a Labrador retriever.
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fun with 3D printers

Escher for Real

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