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. 2014 Sep 16;12:36. doi: 10.1186/1476-7120-12-36

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© Jørgensen et al.; licensee BioMed Central Ltd. 2014

This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Comparison of 2D echocardiographic images from the hibernating and active states of free-ranging brown bears. An arrow indicates the presence of spontaneous echo contrast as echo-dense shadows during hibernation. Also see Additional files 1 and 2.