Honesty is always the best policy, but lying does serve a practical purpose on some rare occasions. Evolutionarily speaking, we are programmed to lie about certain things. For instance it is well-documented in many species that occasionally a female who is bonded to one male, will become pregnant intentionally by a different male, but will return to the pair bond and deceive her current mate into thinking the offspring is his. She may do this because her partner is a better nest builder, or a better father, or a better forager of food. Whatever the case may be, she lies to better her own position or that of her offspring in the long-run.
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Kim
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