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The forked chevrons found on some sauropods probably did not evolve to
protect the tail when dragged on the ground for the following reasons.
1 - As many sauropod trackways show, sauropods did not drag their tails on
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.