The Fwooper is a magical African bird with brightly-colored feathers. The song of the Fwooper will drive the listener insane, so the birds are sold with a Silencing Charm on them (FB). In the book Ancient Runes Made Easy, the Fwooper symbol symbolises the number 4 because it has four different colors: orange, pink, lime green, or yellow (JKR).
Uric the Oddball listened to the Fwooper’s song for 3 months before showing up at the Wizard’s Council wearing nothing but a dead badger, thus proving the song was dangerous to sanity (FB). Newt Scamander had a pink Fwooper in his suitcase when he visited New York City in 1926 (WFT).