Gentoo penguin nesting chronology at Bird Island, South Georgia, from 1988 to 2025 - VERSION 2.0

The chronology of Gentoo penguins on Bird Island, South Georgia has been monitored since 1988 (no data for 1989-90 or 1990-91). 30 nests are marked in the colony at Square Pond, and 40 in the Johnson Beach colony. Regular checks are made to record when eggs are laid and the peak laying date (when 75% of nests have eggs) is calculated.This dataset is an updated version of Trathan, P., Waluda, C., & Ratcliffe, N. (2021). Gentoo penguin nesting chronology at Bird Island, South Georgia, from 1988 to 2019 - VERSION 1.0 (Version 1.0) [Data set]. NERC EDS UK Polar Data Centre. https://doi.org/10.5285/f9993ee9-085f-42cf-b008-5373526b2bcf. The update consists of five additional years of data. No changes have been made to the data included in the previous dataset.This work was funded by Natural Environment Research Council (UK) core funding to the British Antarctic Survey.