The first digit is vestigial and the second, third, and fourth are clawed.
In Cycloturus however the hallux is vestigial and it is absent in Glyptodonts.
There are indications of a vestigial second pair of incisors.
Or, on the other hand, may not such faculty be regarded not as vestigial, but as rudimentary?
Thus the view that the behaviour is vestigial is not perhaps unreasonable.