What is the functional distinction between shallow depressions and established tunnels for a cavy?

Answer

Shallow depressions offer negligible security against determined predators or prolonged exposure.

Shallow scrapes serve for momentary rest or to disrupt morning dew but provide negligible security compared to a fully established tunnel system against predators or weather.

What is the functional distinction between shallow depressions and established tunnels for a cavy?
behavioranimalrodentburrowCavy