Birds trapped by sludge or m u d Sirs,--I was most interested to read the note by G. L. Webber {Brit. Birds, 5 8: 296-297) on 'Birds trapped by sludge on a sewage farm'. I have found at Freckleton sewage farm and various other sites in Lancashire, including the Ribble mud-flats, that this is not as uncommon as he suggests. .Besides most of the species he records, I have noted Ringed Plover Charadriu...

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