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Fig. 2. Changes in depth over time (A,D), and of vertical speed vs depth during descent (B,E) and ascent (C,F), as measured with time-depth recorders (TDRs) during three dives each by two Brünnich's guillemots (A–C; BRGU 82 and D–F; BRGU 87) near Svalbard, Norway. Curves are based on recordings at 1 s intervals.