The Fox Squirrel is an animal with a squirrel-like body and a fox-like head which first appears in Nausicaä of the Valley of the Wind and has cameos in other Studio Ghibli films.
Nausicaä of the Valley of the Wind Edit
Laputa: Castle in the Sky Edit
When Marnie Was There Edit
In When Marnie Was There, a fox squirrel appears as a plush stuffed animal.