The origins of practices in relation to "clean animals" and "unclean animals" are lost to prehistory, but are maintained by several large religions. The idea that some animals are dangerous or disgusting is present in almost all known human cultures. This could be due to the fact that in ancient times people had not realized how to preserve and prepare some foods. For instance, pork not prepared or stored properly can cause illness, as can some seafood. Pigs are also common vectors in transmission of the flu to humans from birds since they are immunologically similar to humans. By labeling the animal as unclean and forbidden, consumption and handling of those potentially dangerous foods would not occur.
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