“The narwhal, Monodon monoceros, has long fascinated sea explorers, scientists and aristocracy. This arctic whale is characterized by a single spiraled tusk extending six to nine feet, emerging from the upper jaw and through the lips of adult males. Males have the characteristic left front tooth extending approximately 8 feet and variable depending on the whale and the age. The right tooth remains embedded in the skull and measures roughly one foot. Some females may exhibit a tusk, and in rare instances a male with two tusks has been observed.”
The function of the tusks has not been fully explained. Theories suggest that they might be:
More info. at Wikipedia
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