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. 2011 Aug 4;6(8):e22479. doi: 10.1371/journal.pone.0022479

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Hemelrijk, Hildenbrandt.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Pictorial representation of attraction to the roost. A) horizontal attraction , normal and intended trajectory for individuals i and j. Trajectories indicate that the turning is sharpest when flying out radially. B) vertical attraction .

Inline graphic — Pictorial representation of attraction to the roost. A) horizontal attraction , normal and intended trajectory for individuals i and j. Trajectories indicate that the turning is sharpest when flying out radially. B) vertical attraction .