1. help animals survive

2. endangered species can breed

3. can be educational

1. offer a safe place to live in and food to eat

2. so that they won't disappear

3. people can learn about animals and their behaviour

1. animals are kept in small places or cages

2. animals live separately from each other

1. they could be unhappy

2. it is not natural for them, as different animals depend on each other for survival