How The Polar Bear Enclosure Will Keep Elephants Warm At The Oregon Zoo...
Elephants and polar bears don’t really have... ...an innovative new heating system that utilizes an underground geothermal loop they call a "slinky" to send the excess heat gene...
https://www.neatorama.com/2014/09/11/How-The-Polar-Bear-Enclosure-Will-Keep-Elephants-Warm-At-The-Oregon-Zoo/
