Supporting Online Material

How Cats Lap: Water Uptake by Felis catus
Pedro M. Reis, Sunghwan Jung, Jeffrey M. Aristoff, Roman Stocker

Supporting Online Material

This supplement contains:
Materials and Methods

This file is in Adobe Acrobat PDF format.

Other Supporting Online Material for this manuscript includes the following:

Movie s1. Three lapping events of an adult domestic cat, during its normal drinking process. The video was recorded with a Sony HDR-SR5 camera operated at 120 frames/s and is here shown at 30 fps (i.e., slowed down four times). As the tip of the tongue comes in contact with the liquid surface, water adheres to the dorsal side of the tongue's tip. A liquid column forms when the tongue is rapidly lifted. The liquid column grows by inertia, until gravity induces its break-up through pinch-off. Jaw closure results in the capture and ingestion of part of this column. The lapping frequency can be calculated from the number of laps in the video.

Movie s2 and Movie s3. Physical model of a cat lapping. The physical experiments consisted of lifting a glass disk from the surface of water. The disk was initially in contact with the free surface of a water bath and was moved upward by a motorized linear stage, FiSER (Filament Stretching Rheometer). As the disk moved upward, the liquid column was imaged from the side with a high-speed digital camera (Phantom V5) at 1000 frames/s and is here shown at 15 frames/s (i.e., slowed down 67 times). In Movie S2, The physical parameters were R =12.7 mm, H = 30 mm, UMAX = 50 cm/s, where R is the radius of the disk, H is the maximum height of travel, and UMAX is the maximum speed attained. In Movie S3, the physical parameters closely match those of the domestic cat: R = 5 mm, H = 30 mm, and UMAX = 74 cm/s.

To view these movies, download a QuickTime viewer.