Pere David's deer (Elaphurus davidianus), once common along China's central and lower Yangtze River basin, were driven to extinction in the early 1900s by hunting and habitat loss. The deer survived in captivity for decades. Then, twenty years ago, wildlife biologists released 39 deer from Woburn Abbey Wildlife Park into to parts of their former habitat along the central Yangtze.

After two decades in the wild, the Pere David's deer population has grown to a thriving 2500 deer. The 20th anniversary of the re-introduction was recently marked by celebrations.

Find out more: Pere David's Deer Thrive in China 20 Years After Re-Introduction (WWF)