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Re: tiny theropod on a tree trunk question

Jaime Headden wrote:

Balance issues? Woodpeckers and squirrels (the latter more than the former,
actually) are the only animals I know of, aside from arthropods, that typically
crawl around head-down on vertical clines.


birds that do "trunk-climbing" use a zygodactylous pes and
their tail to form a "third leg". Parrots use their beaks instead of the tail.

All the Piciforms (not just woodpeckers) have the first and fourth toes reversed, although not all are trunk climbers (Toucans, for example). At the same time, Nuthatches and Creepers are trunk climbers, but don't have the zygodactylous foot found in woodpeckers.