Feathers turn grey: cross-sectional and longitudinal data from red-necked nightjars

Data set supporting the results of the article “Feathers turn grey: patterns and predictors of progressive greying in a cryptic nocturnal bird”, submitted for publication in October 2021. The readme file contains information about the header cells in the datasets. Questions should be addressed to Carlos Camacho (ccamacholmedo@gmail.com). This data set is subjected to a Creative Commons Attribution 4.0 International Licence