Back in July a crew from BBC Radio 4 stayed at Malham Tarn to find the elusive Malham Caddisfly. The Malham Sedge has not been seen for four years. Paul Evans joins a research project run by Ian Wallace on Malham Tarn to find out if this rare Caddisfly still exists.
http://www.bbc.co.uk/iplayer/episode/b013fjqs/The_Living_World_Malham_Caddisfly/
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