Suggested sites for research:

Endangered Species

The Pros and Cons of Zoos and Wildlife Parks

Animal Facts: Zoos, Good or Bad?

Animal Facts 2: Zoos, Good or Bad?

Should Animals be Kept in Zoos?

Association of Zoos and Aquariums

Minnesota Zoo Conservation

The National Center on Physical Activity and Disability

Animal Aid

American Veterinary Medical Association: Is It Ethical to Keep Animals in Zoos?

Are Zoos Cruel?

Zoos: The Historical Debate

Buzzle: The Pros and Cons of Zoos

The Good Zoo and Euthenasia

Should Zoos Close Down?

Keeping Animals in Zoos has BothAdvantages and Disadvantages

Zoos

Captive Breeding and Species Survival