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RE: Alvarezsaur spurs (was Re: dino-lice)
I'd expect the claws to be more hooklike if alvarezsaurids were fixing
themselves to anything.
Is there any extant animal where the juvenile routinely attaches itself to the
adult in a manner that is that painful to the adult?
> Date: Wed, 20 Apr 2011 15:47:10 -0300
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> Subject: Re: Alvarezsaur spurs (was Re: dino-lice)
> 2011/4/20 Don Ohmes :
> > To take a slightly different tack -- is there support in the extant
> > biosphere for a scenario in which the arms were relatively longer and hence
> > more useful in this creature's early lifestages? In other words, do we know
> > of animals (preferably avian) wherein one part of the body is necessary when
> > juvenile but is outgrown by the rest of the body and becomes "vestigial" as
> > they become adults?
> Great viewpoint, analyzing morphology in the dynamics of ontogeny.
> Well, you have kangaroos using powerful forelimbs as young to get a
> grasp on their mother. These forelimbs later become proportionally
> reduced with the development of other body parts. Previously I
> proposed alvarezsaurs may use their forelimbs to fix to larger
> dinosaurs to get free travel. But, it may be that young alvarezsaurs
> fixed this way to the adults of their species.