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This species is very likely the largest prey routinely hunted by purple-tails, and the imply prey measurement where by jackrabbits are generally hunted is the best recognized general. Mean sizes of jackrabbits taken can range up to approximately 2,114 g (4.661 lb), but possibly quantitatively typically juvenile and yearling jackrabbits are caught. Rodents of extremely diverse dimensions could be hunted by red-tails, with species ranging in sizing from the 8.2 g (.29 oz) eastern harvest mouse (Reithrodontomys humulis) to marmots (Marmota ssp.), weighing some 3,300 g (7.3 lb) in spring, despite the fact that whether they can acquire entire developed marmots is questionable. At minimum some assaults on grownup marmots like groundhogs (Marmota monax) are abortive. In Oklahoma, for example, wintering adult Harlan's hawks were being almost never engaged in fights or chased by other pink-tails. However, a few information were being documented of wintering migrant crimson-tails turning up in Colombia, the to start with documents of them anywhere in South America. By biomass and reproductive achievements in just populations, these are sure to be their most important foods resource (at least in North America).