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jack rabbit

noun
  1. any of various large hares of western North America, having very long hind legs and long ears.
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Origin of jack rabbit

1860–65; jack(ass) + rabbit; so named from the size of its ears
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for jack rabbit

jack rabbit

noun
  1. any of various W North American hares, such as Lepus townsendi (white-tailed jack rabbit), having long hind legs and large ears
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Word Origin for jack rabbit

C19: shortened from jackass-rabbit, referring to its long ears
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012