The first Fernandina giant tortoise seen in over 112 years.
Galapagos National Park Directorate
From the reappearance of giant bees to sightings of clouded leopards – can we ever be certain that a species has died out?
Osprey on a nesting platform in Massachusetts.
Chemical pollution and hunting pushed Ospreys to the edge of extinction in the mid-20th century. Today, they have rebounded and can be spotted worldwide, often nesting on manmade structures.
The pine marten – cute but cunning.
We should welcome a native predators' return across the British Isles, while at the same time being honest about the implications.
Scientists are raising Miami blue butterflies in captivity and reintroducing them in south Florida.
Jeff Gage/Florida Museum of Natural History
How do you pack butterflies for shipping, or frogs for an overland hike to a new habitat? Three scientists explain how they keep threatened species safe on the road and in the air.
A female resident orca whale breaches while swimming in Puget Sound in January 2014.
THE CANADIAN PRESS/AP, Elaine Thompson
Noisy waters may be making it harder for southern resident killer whales to communicate with each other and find their food.
Some tropical frogs may be developing resistance to a fungus that has devastated species like
Atelopus varius, the variable harlequin frog.
A look at new research published in 2018 on fossa, deepsea corals and tropical frogs developing resistance to a deadly fungus.
Woolly monkeys are hard to miss in Colombia’s jungles. Now, they face extinction.
Colombian researchers hope to revive an endangered species by rehabilitating monkeys confiscated from smugglers. The captive animals' struggles show that survival is not guaranteed.
Female sage grouse at the Seedskadee National Wildlife Refuge, Wyoming.
The Interior Department is expanding oil and gas leasing on land in six western states that is vital habitat for the greater sage grouse. Lawsuits are certain to follow.
The burrowing owl was once a common sight on the prairies. Now Saskatchewan and Alberta have fewer than 1,000 breeding pairs.
Carving up ecosystems or opening them to development puts the survival of species at risk.
The Endangered Species Act was enacted in 1973 partly to help save the bald eagle, the U.S. national symbol, from extinction. Should public appeal influence which species get priority?
How should the US spend limited funds for conserving endangered species? A new data tool lets managers compare different strategies so they can allocate money to protect the most species.
Releasing a female wolf on Isle Royale, Oct. 2, 2018.
The National Park Service is moving wolves to Isle Royale in Lake Superior to replenish a small pack on the island. Wolves prey on moose, which are overgrazing the island. It doesn't hurt that they are charismatic.
Fossa (Cryptoprocta ferox) at the Houston Zoo.
The fossa, Madagascar's largest predator, is a cat-like carnivore that eats everything from insects to lemurs. Because they are rare and elusive, scientists know very little about them, including how many there are.
Oophaga andresii is one of the newly described species of Harlequin poison frog.
With their jewel-like colours, Colombia's poison frogs are coveted by collectors. Does naming their species help protect them or make them a target for trophy hunters?
A Northern Spotted Owl in Oregon’s Deschutes National Forest.
AP Photo/Don Ryan, File
The Trump administration wants to step up logging, saying it will benefit wildlife by reducing forest fire risks. But wildfires create habitat for threatened Spotted Owls and many other species.
African elephant bull.
Cells that transmit nerve impulses in the part of elephants' brains responsible for functions such as learning and memory are structured differently from those of any other mammal.
The endangered Coquerel’s Sifaka lemur.
The endangered species list is over 90 000 and includes Madagascar's lemurs.
The endangered Sierra Nevada bighorn sheep.
As attempts to water down the Endangered Species Act have accelerated, public support for the act has stayed high. Then why do politicians keep trying to weaken the act?
Australia could sustain wild rhinos, but should it try?
Renaud Fulconis/International Rhino Foundation
Would you pay to see rhinos in Australia's savannas or forests? It's not as crazy as it sounds – and could help save collapsing rhino populations.
Koalas spend a large part of the day sleeping - while their digestive enzymes get to work.
The koala genome, published today, gives us new and valuable information to aid conservation of this marsupial. It identifies special genes that evolved to adapt the koala to its unique lifestyle.
Wollemi pines once covered prehistoric Australia.
Wollemi pines have survived for hundreds of millions of years. Once covering Australia, they now survive in a few isolated spots – but they're coming back in a big way.