Endangered species need protecting

Fifty years ago, America's wildlife was in crisis. Habitat loss and human pollution were driving hundreds of species to the brink of extinction, with no laws in place to protect them. A bi-partisan Congress and President Nixon responded by passing and signing into law the 1973 Endangered Species Act (ESA).

Now, just as we celebrate nearly 50 years of this bedrock law, a new generation of politicians is trying to undermine ESA protections and reverse our progress. Here's a look at some of the endangered wildlife that have recovered thanks to the ESA.