Never seen a Horsfields in the wild that was pyramided. Ridges on the carapace aren't the same as pyramiding. You will see sometimes Spur-thighs, Leopard and Star tortoises that are pyramided in the wild. Most likely those particular animals picked places to sleep at night (when they were first hatched) that were to dry and they became dehydrated. They probably did this over a few months and this would affect their ability to use the calcium, phosphorus and vitamin D3 that they ingest. Therefore pyramiding slightly.
Danny
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