About 400 years ago, beavers were hunted to extinction across Britain. Now they're being reintroduced as little climate warriors, as communities harness their dam-building skills to mitigate flooding.

(Image credit: Dan Kitwood)

He was born before the Great Depression, came of age in WWII, and is still making wildlife documentaries. Brits call David Attenborough a national hero, as he celebrates his 100th birthday.