NatGeo Adds a Little More to the Triassic Burrows

Anthony Martin is a paleontologist at Emory University in Atlanta who was not involved with the study.

"Burrows give a major survival advantage to whoever is living in them," Martin said.

"So there were good reasons for why Mesozoic animals were burrowing to avoid freezing temperatures outside the burrow, all while getting away from predators or safely raising their young."

Except I don't think cold was much of a problem in the early Triassic. Somehow I don't think the Olenekian was terribly cold. The NatGeo article never mentions the procs and only talks about Thrinaxodon.