Figure S1. Graphical user interface provided by the NestTool R package to facilitate rapid manual annotation of breeding behaviours for individual seasons. The panel in the top left allows the user to select the animal and year of interest, and the temporal extent of the data to be shown on the map panel to the right. The map panel shows all locations (colour-coded by time) over the user-specified temporal extent and provides options for different background maps and track lines to be added. The map also shows the nest location extracted from the algorithm based on the GPS location where the animal spent the most time. The two panels at the bottom provide an overview of all the animals that need to be classified (left, including progress of already saved assignments), and the movement metrics summarized for a rolling 5-day window across the breeding season for the focal individual. The user can use the map and the graph with movement metrics to arrive at a decision whether the bird nested and what the outcome of the nesting attempt was and save those assignments with the red button in the top left panel.