Categorize the following animals into either mammals, fish, reptiles, or amphibians.
Pigeon, Turtle, Dolphin
Pigeon: Reptile,
Turtle: Reptile,
Dolphin: Mammal.
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the following animals into either mammals, fish, reptiles, or amphibians.

### Input:
Pigeon, Turtle, Dolphin

### Output:
Pigeon: Reptile,
Turtle: Reptile,
Dolphin: Mammal.