10 iconic animals that were at risk of extinction but rebounded after the Endangered Species Act passed 50 years ago

The bald eagle has been the national bird of the US since 1782, so almost its entire existence as a country. In the early 1700s, it's estimated there were around 400,000 eagles in the lower 48.

But by the mid-1900s, bald eagles were on the verge of extinction due to illegal shooting, habitat destruction, and contamination of their food by the insecticide DDT. In 1963, only 417 nesting pairs of eagles were known to exist in the US.

Bald eagles were first listed as endangered in 1967 under the law that preceded the ESA. After steps were taken to save it — including banning DDT — and the species made a robust recovery.

By 2007, the bald eagle was removed from the ESA list of threatened and endangered species. As of 2020, there were an estimated 71,400 breeding pairs in the US, and 316,700 individuals.

Scientists say the American alligator has roamed the Earth for more than 150 million years, even managing to avoid going extinct when the dinosaurs did 65 million years ago.

But by the 1950s and '60s, the species seemed to have met its match in humans and was nearly wiped out, largely due to poorly regulated hunting and habitat destruction. It was listed as endangered throughout the South in 1967 and hunting was banned.

By 1987, the Fish and Wildlife Service determined the species had fully recovered, and it was removed from the endangered list.

Some 50,000 grizzly bears once roamed the West, from the Pacific coast to the Great Plains. But predator control efforts and habitat destruction nearly eliminated the iconic North American animal.

When grizzly bears were protected under the ESA in 1975, there were as few as 600 bears remaining in the lower 48.

But after decades of recovery efforts, the bears have rebounded. There are now believed to be 2,100 grizzly bears, primarily in the ecosystems around Yellowstone and Glacier National Parks.

While they are still protected under the ESA, the Fish and Wildlife Service is currently reviewing if some populations in Montana and Wyoming have recovered enough to warrant delisting.

Humpback whale populations were decimated by commercial whaling in the 19th and 20th centuries, falling to a low of about 10,000 individuals throughout the world's oceans.

They were listed as endangered in 1970. Thanks to those protections and global conservation efforts concerning whaling, humpback numbers have recovered to an estimated 80,000 whales.

Some population have been removed from the ESA, but others remain protected as humpback still face threats like vessel strikes, entanglement in fishing gear, and underwater noise.

The California condor is one of the largest flying birds in the word, and used to occupy the skies from California to Florida and Canada to Mexico.

It first received federal protection in 1967, but by 1982 there were only 22 condors surviving in the wild. In order to save the species from extinction, the remaining birds were captured, removed from the wild, and put into a breeding program.

In 2004, the first recovery program successfully hatched its first chick in the wild, and in 2008 there were more condors in the wild than in captivity for the first time since the breeding program began.

Today, there are over 300 free-flying condors in the wild.

There were an estimated 3,875 nesting pairs of peregrine falcons in the North America before the 1940s. But in part due to the impact of DDT on the environment, by 1975 the species was down to only 324 known nesting pairs in the US.

Peregrine falcons were listed as endangered in 1970 but have since rebounded, in part due to the banning of DDT and a recovery program that led to 6,000 birds being reintroduced into the wild.

The peregrine falcon was removed from the endangered list in 1999. Today, there are around 3,000 breeding pairs in North America.

The whooping crane is unique to North America and is the tallest bird on the continent, with males reaching nearly 5 feet tall.

Over 10,000 whooping cranes once lived in North America, but shooting and habitat destruction took a toll on the species. The whooping crane was listed as endangered in 1970 and has made a steady recovery since.

In 1941, there were an estimated 21 individuals in the wild. Today, that number is more than 500.

The black-footed ferret is the only species of ferret native to the Americas. In the late 1800s, there were approximately half a million to a million roaming the land, but by the late 1950s, they were presumed to be extinct due to habitat destruction.

But in 1964, a small group of ferrets were discovered in South Dakota and were entered into a breeding program that ultimately proved unsuccessful. In 1979, what was believed to be the last black-footed ferret alive died in captivity. Again, the species was feared extinct.

Meanwhile, the species were listed as endangered in 1967.

In 1981, some black-footed ferrets were rediscovered in Wyoming and another breeding and recovery program was initiated, with the plan to reintroduce them to the wild. Currently, captive breeding facilities are still working on recovering the species.

They have been reintroduced to several locations, but the populations face threats of disease, drought, declining genetic fitness by inbreeding, and loss of genetic diversity, as well as praire dog poisoning and shooting.

There are approximately 300 black-footed ferrets in the wild today, and the efforts to save the species that was twice thought extinct are ongoing.