The piranhaconda from Piranhaconda (2012)
The parts: Presumably, a piranha and an anaconda.
The whole: This might be the daftest movie on this list, which is saying something. But that doesnt stop the titular creature being one of the most horrifying animal hybrids anyone could possibly invent. The movie doesnt dwell on where the piranhacondas origins; they just are, and there are loads of them, and they are basically giant snakes with carnivorous fish heads, and that might be the worst thing ever.
Monstrosity rating: 10/10. Nightmares forever.
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