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Re: Avian flight stroke origin

Augusto Haro <augustoharo@gmail.com> wrote:

> As Tim says, the opposed thumb in the hoatzin is instrumental for it
> to climb.

A clarification: the opposable hallux of juvenile hoatzins is used
principally to _clamber_ through branches, not climb up trunks.
During branch-clambering, the hoatzin chick's foot is employed for
grasping branches, which is the same mechanism used for perching.