Fig. 2
From: Pair bonds during the annual cycle of a long-distance migrant, the Arctic Tern (Sterna paradisaea)
Point-to-point distances between partners for outward a and inward b trajectories, based on locations (latitude, longitude) estimated using FLightR at the dawn and dusk thresholds each day. Line and point colour are distinct for each pair as indicated in the legend (top left) in the graphs. In b, vertical arrows indicate the dates of departure from the Antarctic ice zone, marking the start of return migration (Redfern and Bevan 2020a) for the members of each pair, coloured according to the legend (top left). The reduction of point-to-point distances to 0 in b indicates the arrival of pairs (as units) back to the breeding colony