* Found in birds
* Made of keratin, a protein
* Lightweight and flexible
* Provide insulation and allow birds to fly
* Arranged in a specific pattern on the bird's body
* Can be different colors and patterns
* Help birds with camouflage, courtship, and communication
Scales:
* Found in fish, reptiles, and some birds
* Made of keratin, dentine, and bone
* Hard and inflexible
* Provide protection from the environment and help the animal move
* Arranged in a repeating pattern on the animal's body
* Can be different colors and patterns
* Help with camouflage and temperature regulation