A weird mammal fact that may blow your mind
Placental mammals, like us, are missing an enzyme mediated DNA repair mechanism for dealing with UV damage. That's all well and good, but you know who isn't missing it? Prototherians (monotremes-- Echidnas, platypus) and Metatherians (Marsupials).
That's right. The humble, trash-eating opossum has a more advanced DNA repair mechanism than you, the pinnacle of life as we know it.
