'Concrete ears' once used to detect military aircraft now amplify birdsongs

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The sound mirrors, also known as acoustic mirrors or listening ears, are large concrete structures that once captured sound to detect incoming enemy aircraft before it became visible.

Today the giant concrete mirrors of which there were three designs – 20ft, 30ft and 200ft tall – are part of a Royal Society for the Protection of Birds (RSPB) Nature Reserve.

Forces News was given an exclusive tour of the former RAF Denge site by its current custodians – the RSPB Nature Reserve staff.

More: https://www.forces.net/services/raf/concrete-ears-intercepted-enemy-aircraft-now-form-natural-bird-habitat

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