“THE SUCCESS OF ANY parasite is proportional to its harmlessness. Some are intelligent; they avoid detection, allowing their carriers to lead healthy lives until obsolescence. Fewer, in brilliant acts of symbiosis, foster dependence in the host. But too many are loudmouths and fools, instigating aches, diarrhea, fatigue, bleeding, or other braggadocious symptoms. Most parasites cannot think far enough ahead to maintain the well-being of their host, much less their host’s entire species. Usually, such foresight is not necessary, unless humans are involved. They tend to hold grudges.”
―
Hiron Ennes,
Leech
