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Re: Ah ha! That's where therizinosaurs came from



On 8/14/2011 10:15 AM, Jason Brougham wrote:

What would you say is the adaptive explanation for parrots losing their
furculae?

They simply do not need them, is the null. Neutral traits can be conserved, either by chance, or linkage to other trait(s).

The adaptive question of relevance is "Why did they have wishbones in the first place?", which is obviously goes way beyond parrots.

Good thing it did not happen in turkeys -- it would be culturally disturbing during the holidays.

Here is an observation -- a wild turkey (American-style) can die while gripping a tree-branch, rotate around the branch, and then decompose while hanging upside down, it's feet locked on the branch. Still there 3 weeks later...

I assume the branch diameter was a critical factor.