Many familiar grains today, like quinoa, amaranth, millets, hemp and buckwheat, have traits that indicate that they co-evolved for dispersion by large grazing mammals. During the Pleistocene, massive herds directed the ecology around much of the globe and caused evolutionary changes in plants. Studies of the ecology and growing habits of certain ancient crop relatives indicate that megafaunal herds were necessary for the dispersal of their seeds prior to human intervention. Understanding this process is providing scientists with insights into the early domestication of these plants.
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Source: Phys.org