A 130-year-old tortoise made headlines earlier this year, when it emerged that his prolific sex life had helped save his entire species from extinction in the wild.
"Diego" helped boost a dying tortoise population to over 2,000 after he was shipped from San Diego Zoo to the Galapagos Islands. The amorous reptile was part of a captive breeding program -- initiatives where endangered animals in zoos or other facilities are encouraged to reproduce, with the aim of releasing the offspring in the wild to revive populations that are on the brink.
How captivity saved these animals from extinction | CNN
These species would not exist in the wild today without the efforts of captive breeding programs.