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- W2036823919 abstract "Capitalizing on the opportunities presented by the surface tension of aqueous liquids against air shows natural selection at its most creative. The paper in PNAS by Rico-Guevara and Rubega (1) describes how protruded hummingbird tongues curl lengthwise into a pair of tubes containing nectar. As a tongue contacts nectar on its lower surface or is withdrawn from full submersion, the surface tension of the residual air–nectar interface draws the sides of the tubes up into nearly complete cylinders. Together with the hydrophilic surface of the tongue, lengthwise stiffening rods ensure proper reshaping with no need for muscular activity. After retraction, subsequent protrusion through a tighter bill aperture strips the tongue of the fluid. Neither capillarity nor active pumping needs to take place, and therefore, the high viscosity from the concentrated sugar in the nectar does not present a problem. Viscosity may minimize lengthwise leakage from the cylinders, while viscosity rises steeply with increasing concentrations of sugar, and therefore, surface tension changes much less." @default.
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- W2036823919 date "2011-05-24" @default.
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- W2036823919 title "Surface tension helps a tongue grab liquid" @default.
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- W2036823919 doi "https://doi.org/10.1073/pnas.1107208108" @default.
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