YAKUTSK, Russia — The lab assistant reached into the freezer and lifted out a football-size object in a tattered plastic grocery bag, unwrapping its muddy covering and placing it on a wooden table. It was the severed head of a wolf.

The animal, with bared teeth and mottled fur, appeared ready to lunge. But it had been glowering for some 32,000 years — preserved in the permafrost, 65 feet underground in Yakutia in northeastern Siberia.

As the Arctic, including much of Siberia, warms at least twice as fast as the rest of the world, the permafrost — permanently frozen ground — is thawing. Oddities like the wolf’s head have been emerging more frequently in a land already known for spitting out frozen woolly mammoths whole.

The thawing of the permafrost — along with other changes triggered by global warming — is reshaping this incredibly remote region sometimes called the Kingdom of Winter. It is one of the coldest inhabited places on earth, and huge; Yakutia, if independent, would be the world's eighth largest country.