The Arabian oryx extinct in the wild was successfully bred in captivity and reintroduced into an Oman reserve.

ECONOMIST: From zoo cage to modern ark

The first large-scale survey revealed a treasure trove of rare species, including Siamese crocodiles, previously thought extinct in the wild.

CNN: ASIANOW - TIME Asia | 'There Was Method to My Madness'

Uncontrolled hunting led to this species becoming Extinct in the Wild, with the last remaining wild individual believed to have been shot in Oman in 1972.

FORBES: Conservation International: Stemming the Tide of Environmental Crises, Part Four

Plagued by the chytrid fungus -- which has thrived as water and air temperatures change -- the Panamanian golden frog is all but extinct in the wild.

CNN: Climate change: Time is running out

This is the first time that a species which was once Extinct in the Wild has improved in status by three full categories on the IUCN Red List.

FORBES: Conservation International: Stemming the Tide of Environmental Crises, Part Four

Marwell Zoo has become home to a further four species of Partula tree snail, which originate from islands in the Pacific Ocean and are extinct in the wild.

BBC: Partula tree snail

Only a day after their study was published in the journal Nature, the UN's environment and biodiversity agencies warned that some of the great apes - chimps, gorillas, and orangutans - could be extinct in the wild within a human generation.

BBC: NEWS | Science/Nature | Reading the chimp book of life

Extinct in the wild.

FORBES: Connect

"I think botanical gardens can provide a good insurance policy, by bringing them into cultivation as a way of making sure they don't go completely extinct, but we want them to be secure in the wild as well, " she said.

CNN: Half of magnolias face extinction