The Swooping Evil is a blue and green reptilian flying creature about the size of a parrot but with bat-like wings that can expand to be “butterfly-esque” (FB/f).
Newt Scamander released his Swooping Evil from a small cocoon, to which the creature returned after flying around. The venom is useful for removing bad memories, and after the rampage of the Obscurial Credence Barebone, Newt lets Frank the Thunderbird drop Swooping Evil venom over New York City to obliviate the population and restore calm (WFT).
A swooping evil with bat-like wings resembles several science fiction creatures.
- In the Star Wars feature "The Empire Strikes Back," Mynock Creatures attack the power cables of the Millenium Falcon ship while it rests in an asteroid cave.
- Star Trek's episode "Operation Annihilate has another form of swoopy-flying creatures that make a buzzing sound attack and kill Captain Kirk's brother and sister-in-law after taking over their nervous systems, then they attack Mr. Spock, who fights them with his Vulcan abilities.
- The cocoon of the Swooping Evil and the "butterfly" type wings are reminiscent of the Japanese Mothra movies, called "Godzilla vs. The Thing" in the United States. A giant moth hatches to save the world from other monsters.