Why does the Patagonian cavy favor utilizing opportunistic shelter over self-excavation?

Answer

Digging through tough, arid soil would be energetically costly.

Since digging through the tough, arid soil is costly, utilizing existing shelter allows the cavy to conserve energy, which is essential in their environment.

Why does the Patagonian cavy favor utilizing opportunistic shelter over self-excavation?
behavioranimalrodentburrowCavy