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Reintroduction location: Yellowstone National Park, USA. Outcome: Restoration of the ecosystem's health (trophic cascade).

Reintroduction location: Several states in the USA. Outcome: Removed from the Endangered Species List in 2007.

Reintroduction location: California, USA. Outcome: Population increased from 22 to over 400.

Reintroduction location: China. Outcome: Increased from 'Endangered' to 'Vulnerable' due to captive breeding and reintroduction efforts.

Reintroduction location: U.S. Midwest and Canada. Outcome: From near-extinction to large herds now existing in protected areas.

Reintroduction location: Victoria, Australia. Outcome: Population increased and was downgraded from 'Extinct in the Wild' to 'Endangered'.

Reintroduction location: Lord Howe Island, Australia. Outcome: From presumed extinct to successful rearing and ongoing reintroduction.

Reintroduction location: North America. Outcome: Slowly increasing in numbers but still one of North America's most endangered mammals.

Reintroduction location: North Carolina, USA. Outcome: It's the world's most endangered canid, with ongoing recovery efforts.

Reintroduction location: Atlantic Forest, Brazil. Outcome: Wild population continues to grow with ongoing conservation efforts.

Reintroduction location: Arabian Peninsula. Outcome: Upgraded from 'Endangered' to 'Vulnerable'.

Reintroduction location: Iberian Peninsula. Outcome: Population increased, but still the world's most endangered cat species.

Reintroduction location: Several countries in Europe. Outcome: Gradually increasing population, but still 'Vulnerable'.

Reintroduction location: Mauritius. Outcome: From only a handful of individuals to a sustainable population, still closely monitored.