All species’ data were clipped to t

All species’ data were clipped to the extent of Gauteng’s geographic limits (including pentads, 5′×5′ sampling grids, with partial provincial overlay), and then sorted into ten July–June periods, from July 2007 to June 2017. The normality of the data was established using a normal probability plot. To test whether the reporting rate was a function of observer effort, the proportion of all record cards submitted containing the parakeet was assessed for each data period, and a correlation was done to compare the number of sampled pentads with the number of sampled pentads containing the parakeet across periods.