Details on data collection methodology for 'Wild_CID.csv' can be found in the following publication: Hinke, J., Polito, M., Reiss, C., Trivelpiece, S. & Trivelpiece, W. (2012) Flexible reproductive timing can buffer reproductive success of Pygoscelis spp. penguins in the Antarctic Peninsula region. Marine Ecology Progress Series, 454, 91–104.