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. 2011 Mar 1;6(3):e17332. doi: 10.1371/journal.pone.0017332

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This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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Pack size is determined as the number of metabolic-rate-adult-equivalent wolves (see Pups and prey acquisition rates). The line represents the best fitting polynomial regression: y = 6.58 – 0.20x+0.004x ² (R² = 0.92, P<0.01).