How did zoos develop

Increasingly, modern zoos today are not just seen as a place to see local and exotic animals, but they are treated as places of conservation. However, we can see that in relatively recent history that was not the case, as many older zoos have display areas and cages that clearly were intended to simply display animals to a curious public. The history of zoos has changed, from one of limited display to upper society, to one that was accessible to many. Furthermore, the importance of the animals and how they were seen has changed.