Image:Narwhals breach.jpg

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Description	Narwhales
Source	National Institute of Standards and Technology
Date
Author	Glenn Williams
Permission (Reusing this image)	see below

This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright. Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. العربية | Български | Česky | Deutsch | English | Español | Français | Magyar | Italiano | 日本語 | 한국어 | Polski | Português | ‪中文(繁體)‬ | ‪中文(简体)‬ | +/-

See also: http://www.nist.gov/public_affairs/techbeat/tb2005_1222.htm, article suggests the Narwals are "tusking"

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