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Yutaka Watanuki, Akinori Takahashi, Francis Daunt, Sarah Wanless, Mike Harris, Katsufumi Sato, Yasuhiko Naito
Journal: Journal of Experimental Biology
J Exp Biol (2005) 208 (12): 2207–2216.
Published: 15 June 2005
... changes during the descent, ascent and bottom phases for dives varying between 7 m and 43 m deep. Shags descended and ascended almost vertically (60–90° relative to the sea surface). During descent, swim speed varied between 1.2–1.8 m s –1 and the frequency of the foot stroke used for propulsion decreased...