Figure 2.

Average number of dives (bars with cross lines) and maximum depth reach for any dive (filled circles) recorded for little auks (n = 3) at each hour of day during winter (December–January) (±s.e.). The grey background represents the night/darkness period, while the white background represents the daylight period off Nuuk, southwest Greenland (64°10′ N 51°45′ W). Sunrise and sunset hours were converted to GMT hours. They correspond to the earliest sunrise and latest sunset observed during the study period.