This article was republished on July 21, 2015, to replace the legend for Table 2, which was mistakenly published as body text, to include the photo credit in the caption of Fig 2, and to correct the formatting of the species names in the Descriptions section of the Results. The publisher apologizes for the errors. Please download this article again to view the correct version. The originally published, uncorrected article and the republished, corrected article are provided here for reference.