There is an interesting theory that deer ticks and associated diseases are in a symbiosis with deer by damaging predators and competing species that haven't co-

There is an interesting theory that deer ticks and associated diseases are in a symbiosis with deer by damaging predators and competing species that haven't co-evolved. This tick/disease would be at the maxima of such a natural selection, able to achieve symbiosis perfectly with herbivores it hasn't co-evolved with. A biased probability sort of coincidence. ;)