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Paul said:

>The hind legs of crocs are splayed out to the sides of the anumal
>while slow swimming and act as stabalisers. They have no propulsive
>function and any "wiggles" are a result of movements from the
>tail. In fast pursuit mode, the hindlegs are tucked in against the

in both cases, the tail is the muscle group doing the work, and movement   
of the legs are secondary.  In the case of the fast-swimming croc, the   
legs are held along the body and tail.  These are indeed what I was   
trying to say.  Sorry if it wasn't clear.   A hadrosaur walking would   
then have (the correct term-NOT wiggles) secondary motion in the tail.