We are safe not just thanks to reason in our social behaviour, but also our hygiene: http://www.amazon.com/Parasite-Rex-Bizarre-Dangerous-Creatures/dp/07432001

We are safe not just thanks to reason in our social behaviour, but also our hygiene: http://www.amazon.com/Parasite-Rex-Bizarre-Dangerous-Creatures/dp/074320011X http://www.amazon.com/Parasite-Rex-Bizarre-Dangerous-Creatur... I thought that anyone who has raised a cat knows that animals are jerks (playing with bleeding mice for hours and all), but I was shocked by the added layer of terribleness from parasites in almost all species.