I'm creating a large ungulate that is likely a part of the suborder Anclyopoda. Suspension of disbelief is expected, but there's a detail with the current design that's really bugging me.
The creature is meant to be related to the odd-toed ungulates, but the current iteration of its anatomy has three toes and a fourth as a vestigial-looking thumb. This happened because the animal is meant to be a good climber in order to thrive in their environment.
Should I remove the smaller toe or one of the large ones? Should I just add another thumb? How important is it for the ungulate to keep an odd number of toes through their evolution?