Boobries are a species of birds, first mentioned in Neverseen, that make deafening roaring noises. They are described as black parrot-size birds with glittering dark eyes, a yellow feather mohawk, and extremely long, curled eyelashes. Biana said that Fitz and Keefe make jokes about them all the time, because of their unusual name.
In mythology the Boobrie is a vicious bird that can shapeshift.
In Neverseen, when Biana and Sophie go to a forest to help Calla find out why it is so quiet, Biana and Sophie can only hear a Boobrie. Sophie says it looks like it should be in a mascara commercial, not a Creepy forest.