At Canada’s largest zoo, frozen genetic material from endangered species is being used to repopulate rare animals, both in the wild and in captivity
With some scientists warning that more than half of the world’s animal species are in danger of disappearing before the end of this century, the role of zoos in conservation is becoming more vital. Al Jazeera's Daniel Lak explains.
![](https://i.ytimg.com/vi/uu-R7WXASlM/maxresdefault.jpg)