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Did a nerve agent kill 6,000 sheep close to a US military testing site in 1968?
Whales were being hunted to extinction until a biologist realised they could sing.
The story behind one of the most famous viral videos ever.
In Nov 1996 leading ornithologist Tony Silva was convicted of smuggling endangered birds.
An oil spill in June 2000 threatened tens of thousands of African penguins.
How a disease affecting cattle was transferred to the human population in Britain.
