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. 2010 Mar 29;5(3):e9928. doi: 10.1371/journal.pone.0009928

Figure 4. Changes in the bearings according to the centre of the island of the compass raft (circle) and of the departing (▴) and returning (▾) groups of Guanay cormorants during two consecutive days.

Figure 4

In some cases, when opposing arrows overlay, they appear as a star.