What is a rabbit squirrel mouse called?

There is no animal called a "rabbit squirrel mouse".

It sounds like you're describing a combination of characteristics from different animals:

* Rabbit: Known for their long ears and fluffy tails.

* Squirrel: Known for their bushy tails and ability to climb trees.

* Mouse: Known for their small size and long tails.

It's possible you're thinking of a specific animal that shares some of these characteristics. Could you provide more information?