Over the years, countless animal species fell victim to extinction. And, unfortunately, many of those were caused by human activities.

Now, many international animal conservation organizations are working hard to ensure that many of the animals at risk of extinction are saved from inevitable demise.

Here are a few of those animals that managed to overcome the battle against extinction:

Kihansi Spray Toad

Gray wolves in the U.S. Rocky Mountains were delisted from the endangered list in 2011 after being hunted to near-extinction.

Over the years, run-ins with people have been deadly for grey wolves. Eventually, there were so few left in the lower 48 states that they had to be protected under the Endangered Species Act. This federal law covers plants and animals that are in danger of disappearing from the wild forever.

And, the law worked. The grey wolves are now repopulating.

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