[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

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.






Cheers

Tim