Nested list

Animals
- Pets
  - Canary
  - Cat
  - Dog
  - Gerbil
  - Iguana
  - Mouse
- Farm animals
  - Chicken
  - Cow
  - Duck
  - Horse
  - Pig
  - Sheep
- Wild animals
  - Aardvark
  - Alligator
  - Ant
  - Bear
  - Beaver
  - Cougar
  - Dingo
  - Eagle
  - Elephant
  - Ferret
  - Frog
  - Giraffe
  - Lion
  - Monkey
  - Panda bear
  - Polar bear
  - Tiger
Colors
- Blue
- Green
- Orange
- Purple
- Red
- Yellow
Vehicles
- Cars
  - Acura
  - Audi
  - BMW
  - Cadillac
  - Chrysler
  - Dodge
  - Ferrari
  - Ford
  - GMC
  - Honda
  - Hyundai
  - Infiniti
  - Jeep
  - Kia
  - Lexus
  - Mini
  - Nissan
  - Porsche
  - Subaru
  - Toyota
  - Volkswagon
  - Volvo
- Planes
  - Boeing
  - Cessna
  - Derringer
  - Embraer
  - Gulfstream
  - Piper Aircraft
  - Raytheon
- Construction