Australia has about 800 species of bird, ranging from the tiny 8 cm Weebill to the huge, flightless Emu. Many species will immediately seem familiar to visitors from the northern hemisphere - Australian wrens look and act much like northern hemisphere wrens and Australian robins seem to be close relatives of the northern hemisphere robins, but in fact the majority of Australian passerines are descended from the ancestors of the crow family, and the close resemblance is misleading: the cause is not genetic relatedness but convergent evolution.
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