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Why lizards have bird breath: Iguanas evolved one-way lungs surprisingly like those of birds

Discussion in 'The Library' started by Rich, Jan 21, 2015.

  1. Rich

    Rich Administrator Staff Member Premium Member

    Biologists long assumed that one-way air flow was a special adaptation in birds driven by the intense energy demands of flight. But now scientists have shown that bird-like breathing also developed in green iguanas – reptiles not known for high-capacity aerobic fitness. The finding bolsters the case that unidirectional bird-like flow evolved long before the first birds. 6FTTQTQ78vE.gif

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