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Page last updated at 10:51 GMT, Friday, 20 August 2010 11:51 UK
BTO link greenfinch decline to trichomonosis

The BTO has linked the decline in greenfinch numbers to trichomonosis

The British Trust for Ornithology, based in Thetford, has linked a decline in greenfinch numbers to disease.

Trichomonosis, caused by a microscopic parasite, affects many birds but greenfinches have suffered more than other species.

"We've now got a handle on just how much the decline is... 36% in some areas," said the BTO's Graham Appleton.

The best way to prevent the disease spreading is to keep bird feeders and baths clean.

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