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> 2 - Big reptiles that do drag their tails on the ground do not have forked
> The animals that do have forked chevrons are the giant ground sloths, which
> very probably used their tails as props when they feed on two legs. Sauropods
> probably did the same thing.
This may be the best evidence yet for the upright feeding posture
in diplodocids and euhelopids. It is indeed notable that the forked
chevrons occur in just those sauropod families that are most often
considered to have reared up to feed, and are absent in those families
that fairly clearly fed giraffe-style.
The peace of God be with you.