The birth marks the first successful artificial insemination birth of a southern white rhino in North America.
Compiled by 145 expert authors from 50 countries, the study found that up to one million of Earth's estimated eight million plant, insect and animal species are at risk of extinction, some within decades.
According to Ecuador's environment ministry, 186 of the frog species are at risk of becoming extinct due to poaching.
The country's famed Barbary macaque may "disappear within 10 years", conservation groups have warned.
China's efforts to increase the numbers of its black-and-white national icon, the giant panda, has paid off.
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