Even before they can fly, some young birds can run up vertical surfaces by using their wingbeats to add traction to their legs. Such behaviour may be relevant to understanding the origin of avian flight.
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Hutchinson, J. Early birds surmount steep slopes. Nature 426, 777–778 (2003). https://doi.org/10.1038/426777a
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DOI: https://doi.org/10.1038/426777a
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