This site describes the effect of a regular pattern of round protuberances on the flippers of humpback whales on how water flows past these flippers. The site includes a photograph of dye streams in a testing tank that reveals the flow pattern.
American Physical Society. Flow Pattern on a Hydrofoil. College Park: American Physical Society, September 22, 2008. http://www.aps.org/about/physics-images/archive/hydrofoil.cfm (accessed 3 September 2015).
%0 Electronic Source %D September 22, 2008 %T Flow Pattern on a Hydrofoil %I American Physical Society %V 2015 %N 3 September 2015 %8 September 22, 2008 %9 image/jpeg %U http://www.aps.org/about/physics-images/archive/hydrofoil.cfm
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