I don't know exactly if any of this is true or not, but from what I'm seeing floating around on social media, it turns out that the character of Scrat was actually stolen from somebody else who pitched the idea of a character named Sqrat (a mix of a squirrel and a rat) and an animated movie built around the character to 20th Century Fox a few years before they did ICE AGE with the character known as Scrat . . . and, supposedly, she actually won a trademark/copyright infringement suit over the character, so I guess now Disney can't legally do anything with Scrat anymore despite now owning the IA franchise.