Chica is the older model of the original Chica making an appearance in the second game, along with the three other older animatronics who have all fallen into severe disrepair. She is replaced by her newer counterpart for the "improved" Freddy Fazbender's Pizza, Toy Chica.
Chica fell into severe disrepair and was replaced by Toy Chica. She can be found in the Parts and Service room with the other animatronics.
For a start, the feminine features have been toned down, and she appears more androgynous as a result, to contrast her more with Toy Chica. Her body seems to have minimal changes. Perhaps the most disturbing alterations are in the head area; Withered Chica's eye sockets are now much larger than the eyes themselves, and she lacks eyebrows as well as her eyelids. If one looks really closely, her eyeballs appear to have nearly-visible blood-veins in a grey color (which are better seen during her jumpscare). Furthermore, like in the first game, her irises are magenta in color. Similar to Foxy, her feet also have three talons, rather than two talons.

Her beak has a jaw similar to the ones Bonnie and Freddy have, which appears to be completely unhinged. Her beak is also more pointed, like that of an actual chicken, and she has even more teeth on her upper and lower beak. The infamous second set of teeth from the endoskeleton itself is also clearly visible. She has two stumps where her hands used to be, with long wires poking out.