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. 2019 Aug 27;7:28. doi: 10.1186/s40462-019-0172-6

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© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. 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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Fig. 2 — Meerkat with collar, axes, and Earth’s fields. The orientation of the axes of the triaxial magnetometer fixed to a collar on the meerkat along with the directions of two of Earth’s naturally occurring fields: Earth’s magnetic field ${\vec{B}}_{E}$ pointing towards the magnetic North Pole, and Earth’s gravity vector $\vec{g}$ pointing vertically downwards