Tanzania's Kihansi Spray Toad
The inch-long Kihansi spray toad (Nectophrynoides asperginis) is the first amphibian species to have been successfully restored to the wild after having been declared extinct. In 2009, the Bronx Zoo collected a number of wild toads to preserve them against extinction, and in 2016, released 1,000 Kihansis born in zoos.
American bison (Bison bison) once roamed North America in the tens of millions before being decimated at the turn of the 20th century to just 1,100 individuals. Coordinated efforts between state, local, tribal, and federal governments with conservation organizations has since helped restore free-ranging bison to the Rocky Mountains and their populations are now considered stable.
Maleos in Sulawesi
Endemic only to northern Indonesia, maleo numbers have steadily declined in recent years due to increasing human development. The intertidal Macrocephalon maleo are now recovering after the establishment of Bogani Nani Wartabone National Park, whose enforcement efforts have led to a safe space for nesting birds to lay eggs.
Scarlet Macaws in Guatemala
Poaching and habitat loss have pushed Guatemala's scarlet macaws (Ara macao) towards extinction with only 250 individuals left in the nation's Maya Biosphere Reserve (MBR). A number of conservation efforts, including community-based conservation and husbandry, have led to the highest fledging rate in 17 years of monitoring, with an average of 1.14 fledglings per active nest.
Tigers in Western Thailand
Long-term efforts to combat poaching have boosted tiger (Panthera tigris) populations in Thailand's Huai Kha Khaeng Wildlife Sanctuary. Tiger numbers have risen by 60 percent since 2010 to 66 individuals today.