Figure 7.

Extension of the Antarctic pack‐ice zone in November (a) and March (b), which are the times for the arrival of arctic terns at this zone (November) and departure from it (March; cf Table 1). The illustration was downloaded from the National Snow & Ice Data Center (https://nsidc.org/data/seaice_index/archives/). November 2014 and March 2015 were selected as example years. The monthly patterns are similar between years as seen from the median distributions 1981–2010, indicated by yellow lines). During their four‐and‐a‐half months stay in the Antarctic pack‐ice zone, the terns moved westward toward the Weddell Sea region (Figures 4 and 5) where much sea ice still remains in March