Since Rabbi Lapin has identified godless folk as "parasites", we need a field guide to atheist parasites, just so you can avoid them. They're horrible little creatures with filthy habits, like writing or teaching math.
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Thanks to PZ Myers for calling attention to this superb video of Corydceps, a parasitic fungus that drives its insect host up a plant before growing a spike out of its head.
Over the past decade, some coastal waters have started turning red with a
Ectatomma parasiticum Feitosa & Fresneau 2008
Mexico
Most parasites are really, really small. Especially the ones that mess with brains - they tend to be able to fit in them. But not all parasites that can do some fun jedi mind tricks are so itsy-bitsy.