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



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


Dan Ohmes wrote:
>
> 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.

Do you feel that simply not needing them explains the pattern? That 19 out
of 67 genera of parrots simply no longer need furculae, while the
remaining genera and all other flying bird families still need them? That
doesn't sound like a very compelling adaptationist argument to me.