Given categories of animals (mammal, reptile, fish, bird, amphibian), classify a squirrel into one of them
A squirrel is classified as a mammal.
Complete the following task based on the instruction and optional input provided.### Instruction:
Given categories of animals (mammal, reptile, fish, bird, amphibian), classify a squirrel into one of them

### Output:
A squirrel is classified as a mammal.