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Figures 2 and 4 are corrupted in the HTML article. Please use the following links to access the proper versions of these figures.
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Figure 4:
Figure 3 incorrectly refers to "Anas clypeata" in the diagram. This has been replaced with "Anas sibilatrix". The correct figure can be seen at the following link:
http://plosone.org/corrections/pone.0063334.g003.tif
Competing Interests: No competing interests declared.
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