Some of the threats included grazing animals, which destroyed the birds' habitat, and mosquitoes that carried avian malaria.
BBC: Birds at risk reach record high
However, a new analysis of the spread of avian malaria shows that for the birds, at least, there is a real worry.
ECONOMIST: Malaria among birds is becoming more prevalent
The blackcap (Sylvia atricapilla), a migrant bird common in Europe that breeds in gardens, once had virtually no avian malaria but a study in 1999 showed nearly 4% had the disease.
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