caption: Invasive birds and avian malaria In many parts of the world the European House Sparrow is an invasive introduced species Native species have declined in the US, for example, as a result of the spread of the European House Sparrow It had been hypothesised that the introduction of the sparrow had also introduced a European species of avian malaria that the native birds species were particularly susceptible to The study below showed that, in fact, the sparrow had lost its avian malaria and this increased fitness had given it a competitive advantage Source: <PERSON>
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