According to the study, opossums are our best natural defense against tick-borne diseases. That's right, the lowly opossum—primitive, slow-witted, and more apt to faint than fight might be the answer for combating a growing tick population. Despite their unfortunate appearance and tendency to munch on road kill, often resulting in them becoming road kill themselves, opossums are very clean. They spend more time grooming than domestic cats and, being warm-blooded and low slung, are natural tick magnets. Fortunately for opossums, though, more ticks mean more snacks, as it's down the hatch for the blood-sucking freeloaders as the opossums groom.