Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 112, Issue 52, Pages 15798-15802Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1514842112
Keywords
drinking; lapping; open pumping; biomechanics
Categories
Funding
- National Science Foundation [PoLS-1205642, CBET-1336038, IDBR-1152304]
- Direct For Biological Sciences
- Div Of Biological Infrastructure [1152304] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1336038] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1205642] Funding Source: National Science Foundation
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Dogs lap because they have incomplete cheeks and cannot suck. When lapping, a dog's tongue pulls a liquid column from the bath, suggesting that the hydrodynamics of column formation are critical to understanding how dogs drink. We measured lapping in 19 dogs and used the results to generate a physical model of the tongue's interaction with the air-fluid interface. These experiments help to explain how dogs exploit the fluid dynamics of the generated column. The results demonstrate that effects of acceleration govern lapping frequency, which suggests that dogs curl the tongue to create a larger liquid column. Comparing lapping in dogs and cats reveals that, despite similar morphology, these carnivores lap in different physical regimes: an unsteady inertial regime for dogs and steady inertial regime for cats.
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