speed

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The hummingbird micropump

A new study published in the Proceedings of the Royal Society B: Biological Sciences provides evidence that hummingbird tongues act like micropumps when drinking nectar. This finding is in contrast to the long-held belief that their tongues use capillary action to pull in fluids. A team of researchers from the University of Connecticut used high-speed film to…

Gray’s paradox was originated by the zoologist James Gray in 1936 (J. Exp. Biol. 13: 192–199, 1936). The paradox questioned how a dolphin is able to swim fast (~10.1 meters per second according to his calculations) with what he saw as a limited ability to generate that much power. Therefore, he concluded that dolphins must have…