The "Unknown Giant Bird" is a corrupted Gem that Garnet poofed at the beginning of "Universe and the Moon" apart of the Steven Universe (comic series).
The Unknown Giant Bird resembles a blue, giant bird. She has two gray legs and her feet have at least three toes each. Her gemstone lies inside her torso.
The Unknown Giant Bird is seen flying and has captured Greg. She is later "poofed" by Garnet, and is bubbled by Amethyst.
||It is located in the torso of the Giant Bird.