The conversation between human and AI assistant.
[|Human|] Categorize the animals in the following list: dogs, cats, pigs, fish
[|AI|] One way to categorize the animals in the list is by their habitat and physical characteristics:

- Domesticated land animals: dogs, cats, pigs
- Aquatic animals: fish
[|Human|] 
Categorize the animals in the following list: dogs, cats, pigs, fish