黑头莺在欧洲一种常见的候鸟，它们生活在很多公园里，实际上它们曾经并没有禽虐感染，但是1999年的一项研究显示，几乎4%的黑头莺感染了这种疾病。
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.
一项研究表明，苇莺攻击长得像鹰的杜鹃的几率比较少。
A study has shown that reed warblers - a cuckoo host species - are less likely to attack more "hawk-like" cuckoos.
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