- "A large, butterfly-like creature that emerges from a small object, possibly a cocoon."
- —Description of a Swooping Evil[src]
The Swooping Evil is a blue-and-green winged magical creature. It appears similar to an extremely large butterfly but with a wolf-like skull in place of an ordinary head. When it is not flying with its spiked wings, the Swooping Evil shrinks into a green spiny cocoon.
It can be quite dangerous, as it is an encephalophage — it feeds on people's brains — and its tough green skin has the ability to deflect at least some spells. It secretes venom that, when properly diluted, can be used to erase bad memories.
A vial of its venom was diffused over New York City through a rainstorm created by Frank, Newt's captive Thunderbird, over the city's entire No-Maj population, with the rain water effectively oblivating of all their bad memories of magic and therefore preserving the security and secrecy of the magical community.
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