Photos: "Smiling" Tarsier Among New Most Endangered Species

Dwarf Salamander: Facing Shrinking Chances

Photograph courtesy Todd Pierson

The Chuj climbing salamander, a species of dwarf salamander from Guatemala, is another addition to the critically endangered category of the 2011 Red List.

The salamanders are found in a limited area of hardwood forest, much of which has been cut for farming and firewood. But local authorities are also working hard to protect a remaining stretch of forest where the amphibians still thrive.

"It's a classic example of how humans impact biodiversity around the world," Miller said. "We have the power to destroy—but also the power to protect."

(See "Three New Salamanders Found in Remote Cloud Forests.")

Published June 22, 2011

Bog Turtle, Big Trouble

Photograph by George Grall, National Geographic

This tiny, critically endangered bog turtle, Clemmys muhlenbergi, is one of the world's smallest, squeezing into a 3- to 4.5-inch (7.9- to 11.4-centimeter) shell. But the eastern-U.S. reptile represents a big conservation problem. Wetland development and drainage have drastically reduced suitable habitat for this and many other species around the globe.

U.S. turtles, like C. muhlenbergi, are far less threatened than their Asian relatives, but their fates are increasingly bound together: Asia's appetite for turtles as food and the pet trade is harming turtle populations halfway around the world.

(Related: "Millions of U.S. Turtles Consumed in China Annually.")

Published June 22, 2011

Harlequin Toad: One of Only Two Known

Photograph courtesy Alessandro Catenazzi

Nineteen new frogs, toads, and salamanders were added to the Red List this year, and eight are said to be critically endangered—including Peru's harlequin toad.

Extensive surveys of the toad's forest habitat in 2010 turned up only two individuals.

Amphibians are one of the hardest hit animal groups, with an estimated four in ten species at risk of extinction from threats including habitat loss, pollution, and disease.

("Photos: Ten Most Wanted 'Extinct' Amphibians.")

Published June 22, 2011

Arabian Oryx: Bounding Back

Photograph by Michael Nichols, National Geographic

In addition to the newly critically endangered species, the new Red List boasts a few bright spots. The future looks bright, for example, for the Arabian oryx, which not long ago nearly vanished forever.

The last wild antelope was shot in 1972. But captive breeding and reintroduction efforts have rebuilt a wild population of at least a thousand individuals—moving the animal from "endangered" to the less serious "vulnerable" category.

(Related: "Arabian 'Unicorn' Leaps Out of Near Extinction.")

"This is proof that conservation really does work," Miller said.

"If it's intelligently designed and done well, it can really pay off, and we can see recovery of species that were on the brink of extinction."

Published June 22, 2011