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> This is also an explanation as to why big quadrupedal dinos never lost their
> big tails.  There is no real reason sauropods needed long tails for balance
> or whatever.  They did need them to anchor their leg muscles though, and
> there was no real reason to change to the calf dominent bird style, since the
> tails of sauropods didn't get in the way like they would in the branches of a
> tree.
        My guess is that diplodocids at least did need a tail- for
balance when rearing up and once in a fully tripodal position for a prop;
likely the stegosaurs did so as well.