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1 July 2018 Crow's Weightlifting: How and How Heavy a Crow Lifted with Its Bill
Midori Saeki, Hoshiko Yoshida
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Abstract

An adult Large-billed Crow Corvus macrorhynchos proved capable of lifting weights of 1,100 g with its bill, equivalent to 1.5 times its body mass. It also attempted various other techniques, using its feet, flapping its wings, and using a fulcrum to flip the weight over. The effort used to lift weights varied greatly and was not always consistent with the weight increase; for example, the crow took more than 12 minutes and 23 attempts to lift 990 g but only took 27 seconds and seven attempts to lift 1,090 g. The crow's strategy seemed to change over a series of experiments, from using muscle power to energy saving techniques.

© The Ornithological Society of Japan 2018
Midori Saeki and Hoshiko Yoshida "Crow's Weightlifting: How and How Heavy a Crow Lifted with Its Bill," Ornithological Science 17(2), 237-244, (1 July 2018). https://doi.org/10.2326/osj.17.237
Received: 8 December 2017; Accepted: 4 February 2018; Published: 1 July 2018
JOURNAL ARTICLE
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KEYWORDS
Corvus macrorhynchos
Large-billed Crow
lifting ability
lifting technique
physical performance
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