1472-6785-7-14-2.jpg (95 kB)

Upside-down swimming behaviour of free-ranging narwhals-3

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posted on 2011-12-30, 19:49 authored by Rune Dietz, Ari D Shapiro, Mehdi Bakhtiari, Jack Orr, Peter L Tyack, Pierre Richard, Ida Grønborg Eskesen, Greg Marshall

Copyright information:

Taken from "Upside-down swimming behaviour of free-ranging narwhals"

http://www.biomedcentral.com/1472-6785/7/14

BMC Ecology 2007;7():14-14.

Published online 19 Nov 2007

PMCID:PMC2238733.

position with the blowhole oriented towards the surface. Note the mirror effect of the water surface. Picture captured from Crittercam footage (see online electronic supplement, additional file ). Narwhal swimming upside-down (dark back oriented towards the bottom and the white belly oriented upwards) along the inlet's bottom accompanied by two other narwhals from the same group displaying identical behaviour. Picture captured from Crittercam footage (see online electronic supplement, additonal file ). Photograph and footage courtesy of National Geographic Remote Imaging.