Thomas de Groot <tho### [at] degrootorg> wrote:
> As far as belly dragging is concerned, reptiles lift their belly when
> active, even crocodiles do. The reptiles from the Permian are often
> pictured in an erect pose (Lystrosaurus, Moschops for instance); see
> http://www.youtube.com/watch?v=AHJDejFGDwk. I am not too sure if that is
> their most common pose considering their anatomy, but there it is.

Lystrosaurus and mostrops are both therapsids, which is the line that evolved
into mammals.  An erect posture would make sense.

(Therapsids dominated the mid to late Permian.  I have heard the Permian called
the "First Age of Mammals.")

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