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The US has published transcripts, video clips and audio recordings about unidentified flying objects, also called unidentified anomalous phenomena.

From hanging out with primates to early climate warnings, here's a selection of his trailblazing programmes.

Children release 100 butterflies at a Warwickshire farm for the broadcaster's centennial.

BBC producers talk about working with Sir David Attenborough on his 100th birthday.

Photographers travel across the country to catch a glimpse of the birds in Christchurch.

As Sir David Attenborough turns 100 years old, here is how he helped nature in Hampshire and Dorset.

The zoo says it hopes it will "inspire visitors to appreciate and help protect" endangered vultures.

Molecules that can capture heat could be a useful technology to decarbonise heating.

The European eel population has declined sharply since the 1980s due to environmental factors.

Sweet wrappers, drinks containers and fast-food packaging were the most common items, campaigners said.