"Herpetophobia, or fear of reptiles, is a relatively common phobia. Severity can vary drastically, making it difficult to decide whether you have a clinical phobia or simply a fear. Herpetophobia, like arachnophobia (fear of spiders), is believed by many to be an evolutionary phobia. Our ancestors tended to fear those animals that could cause harm, and the sheer number of venomous reptiles may have caused herpetophobia to develop over time."
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(Source: phobias.about.com)
