my reasoning is that none of the animatronics did it but te toys. so first of all it could not be mangle cuse she was made after the bite of 87 she was first put in the second game.and if it were foxy some one would see the blood on his fur coat eventully because it is pretty hard to get blood out of fabric so what ever/ who ever did it would have to be plastic cuse that would be very easy to wash off just a damn rag and then your farly clean. but that also leaves checa (sorry if i spell names or any thing wrong)(the chicken) but she does not have the build for it. and my other reason it could not be foxy is becuse his fox mouth is only fabric and the only thing that would be able to bite with out breaking on foxy would be the endoskeliten but its teeth would not work for that(doesnt open wide enough). any way back to the fabric they would nnot have the resourses to wash it off them self if foxy did it but you can find a sink and a rag in almost any resurant.