The Trick to Not Freezing During Hibernation

You may wish that you could pack on a few pounds and sleep the next few months away, and scientists are one step closer to understanding how some animals are capable of doing this.

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Sources:

Squirrels
https://www.eurekalert.org/emb_releases/2017-12/cp-hsa121417.php
http://www.cell.com/cell-reports/fulltext/S2211-1247(17)31750-3
https://www.ncbi.nlm.nih.gov/pubmed/17538622
https://www.sciencedirect.com/science/article/pii/S0896627304005380

Penguins
https://www.nature.com/articles/s41467-017-01959-6
https://www.nature.com/articles/d41586-017-08565-y
https://www.nytimes.com/2017/12/12/science/ancient-penguins-kumimanu.html
https://www.livescience.com/61178-giant-penguin-fossils.html
https://www.theguardian.com/science/2017/dec/12/fossil-hunters-find-man-sized-penguin-on-new-zealand-beach