Do zoos help or hurt animals? - Vox

Zoos say they’re leaders in protecting wildlife. But is it true?

Brookfield Zoo, Lincoln Park Zoo, Shedd Aquarium: Don't weaken Endangered Species Act - Chicago Sun-Times

How do we fix the zoo?

The Case for the End of the Modern Zoo

Should Animals Be Kept in Zoos? - DebateWise

Zoos try to create wildlife settings for animals' mental stability

My view: The moral case for zoos and aquariums - Deseret News

The 5 Worst Zoos In The World -- And How To Save Their Animals - The Dodo

Why are zoos bad for animals? They get to be fed, they don't have to worry about predators, and they get treated for sickness. It's not like a circus where they are

Why is it so hard for zoos to breed endangered animals?

Opinion Zoos Are Bad for Animals - The New York Times