The animal with the lowest body temperature recorded among mammals is the Arctic ground squirrel (Spermophilus parryi). During hibernation, their body temperature can drop below freezing, a condition known as supercooling.
Here's the breakdown:
- Hibernation Masters: Arctic ground squirrels are champions of hibernation. As winter approaches, they enter a deep sleep-like state to conserve energy during the harsh Arctic months.
- Body Temperature Plunge: During hibernation, their body temperature can drop dramatically, reaching as low as -2°C (28°F). This is significantly lower than the normal body temperature of mammals, which typically falls around 37°C (98.6°F).
- Supercooling Power: What's even more remarkable is that these squirrels enter a state of supercooling. Their body fluids don't freeze despite being below freezing temperatures, thanks to special adaptations that prevent ice crystals from forming.
- Not Quite Frozen: It's important to note that the squirrels aren't completely frozen. They maintain some metabolic activity and can even arouse briefly from hibernation to raise their body temperature slightly.
So, while they don't hold the record for the entire animal kingdom, Arctic ground squirrels are the undisputed champions among mammals when it comes to lowering their body temperature for survival.
