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. 2014 Feb 6;11(91):20131033. doi: 10.1098/rsif.2013.1033

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© 2013 The Author(s) Published by the Royal Society. All rights reserved.

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Figure 1. — A cluster at an ambient temperature of (a) 11°C and (b) 27°C, approximately 12 cm across (Photo courtesy of [18]). Note that number of bees inside the cluster is nearly constant; change in cluster width is a result of changes in bee packing fraction [1]. (c) Schematic of interior (Ω), and boundary (δΩ), with mantle–core structure. are radial, vertical directions in polar coordinates, R is the cluster radius.

Inline graphic — A cluster at an ambient temperature of (a) 11°C and (b) 27°C, approximately 12 cm across (Photo courtesy of [18]). Note that number of bees inside the cluster is nearly constant; change in cluster width is a result of changes in bee packing fraction [1]. (c) Schematic of interior (Ω), and boundary (δΩ), with mantle–core structure. are radial, vertical directions in polar coordinates, R is the cluster radius.