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Fig. 3. Changes in (A) estimated buoyancy vs depth and (B) depth
vs time, and (CH) body angle (from horizontal), vertical
speed, actual swim speed and stroke rate vs depth, for a
Brünnich's guillemot (BRGU 13) during descent to 113 m (CE) and
during ascent (FH). Values are averages over 3 s intervals of
recordings at 1 Hz. The depth of neutral buoyancy was estimated as 71 m.