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RE: Bipedal apatosaurs and stegosaurs?

The assertions by one or more contributers to this board that rearing by
sauropods would be energy inefficient is entirely false. The energy cost of a
sauropod rearing would be trivial compared to the large number of calories to
be gained that would be otherwise out of reach. Consider that elephants will
walk 20 miles in a day to reach food source. Here we are talking about an
animal lifting its body a few feet to reach many pounds of food.