Classify the following animal as either an amphibian, a reptile, or a mammal.
Hedgehog
Hedgehog is a mammal.
Complete the following task based on the instruction and optional input provided.### Instruction:
Classify the following animal as either an amphibian, a reptile, or a mammal.

### Input:
Hedgehog

### Output:
Hedgehog is a mammal.