Unusual Small Reptile has two different mitochondrial genome, lives to ca 100 years and can stand cold temperatures

[Saul]

https://www.sciencenews.org/article/lizard-like-tuatara-mitochondrial-genomes-cold-tolerance?utm_source=Editors_Picks&utm_medium=email&utm_campaign=editorspicks013121

[Ron Put]

Strange, indeed.  I remember being told it's the last surviving member of species common about 100-200 million years ago. It can be active in almost freezing temperatures apparently and your link seems to help explain why. Thanks.