Give two examples for the following concept.
Types of animals
1. Mammals: e.g. Lions, Elephants
2. Birds: e.g. Eagles, Penguins
Complete the following task based on the instruction and optional input provided.### Instruction:
Give two examples for the following concept.

### Input:
Types of animals

### Output:
1. Mammals: e.g. Lions, Elephants
2. Birds: e.g. Eagles, Penguins