Tasmanian devils aren't exactly known for over sharing except for one thing,cancer. While it is mostly unknown in the rest of the animal world the devils have a type of facial cancer tumor that when they fight with each other they spread the cancer. For awhile scientists feared the cancer would lead to the devils extinction but some of the little guys are cancer resistant and can either heal the tumors or live without being adversely affected,in turn they pass this trait on to their offspring kind of like natural selection in reverse. So they are safe for now from the cancer,but still vulnerable to other environmental changes as are all the rest of us.
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