In the Disney film 'Dumbo', what kind of animal is Dumbo's friend Timothy?

Timothy Q. Mouse is Dumbo's best friend, mentor and the deuteragonist of Disney's 1941 animated feature film Dumbo.

In contrast to the soft and innocent nature of Dumbo, Timothy is brazen, fearless, and shrewd. Throughout the film, however, Timothy's primary goal is to make Dumbo happy and help him rescue his mother, showing a sympathetic quality despite his rough, stereotypically Brooklyn personality.

Timothy acts as the much needed protector in Dumbo's life, standing up for the saddened elephant when others attack him on account of his abnormally large ears. He cares for Dumbo, and truly wants him to succeed in life, save his mother, and prove to the world that he is not some abomination. And with the determination that Timothy's famous for, the duo manage to accomplish just that. Not only does he acts as Dumbo's manager and motivator, but as his closest friend, and for a while, his only friend.