Differentiate between
Zoo and wildlife sanctuary

Explanation

In both zoo and wildlife sanctuary, wild animals are preserved and conserved. But, in wildlife sanctuary, the animals get their natural habitat and naturally available food, on the other hand, in zoo, these animals are provided artificial habitat and foods are also not fresh.
The animals living in the zoo are looked after by animal doctors, in case they fall sick, which is not possible in the forest.
In spite of being given a lot of artificial facilities, the animals do not remain hale and hearty, whereas in their natural habitat they are free, hale and hearty.