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http://www.nwf.org/wildlife/wildlife-library/mammals/gray-wolf.aspx
http://www.macalester.edu/~montgomery/GrayWolf.html
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http://www.defenders.org/gray-wolf/basic-facts
http://www.defenders.org/gray-wolf/basic-facts
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http://www.science20.com/news_articles/why_dogs_can_be_tamed_wolves_cannot-101197
http://wiki.answers.com/Q/what_is_a_male_wolf_called#slide2
http://www.defenders.org/gray-wolf/basic-facts
http://www.theguardian.com/environment/2009/sep/01/grey-wolf-idaho-montana-wyoming
http://www.nwf.org/wildlife/wildlife-library/mammals/gray-wolf.aspx
http://www.pbs.org/wnet/nature/episodes/river-of-no-return/gray-wolf-fact-sheet/7659/
http://www.animalfactguide.com/animal-facts/gray-wolf/
http://www.nwf.org/wildlife/wildlife-library/mammals/gray-wolf.aspx
http://www.macalester.edu/~montgomery/GrayWolf.html
http://animals.pawnation.com/habitat-gray-wolves-1165.html
http://www.defenders.org/gray-wolf/basic-facts
http://www.defenders.org/gray-wolf/basic-facts
http://www.theanimalfiles.com/mammals/carnivores/wolf_grey.html
http://www.ask.com/question/what-is-a-female-wolf-called
http://www.science20.com/news_articles/why_dogs_can_be_tamed_wolves_cannot-101197
http://wiki.answers.com/Q/what_is_a_male_wolf_called#slide2
http://www.defenders.org/gray-wolf/basic-facts
http://www.theguardian.com/environment/2009/sep/01/grey-wolf-idaho-montana-wyoming