Marabou stork of any landbird, to rival the Andean condor; more typically, however, these storks measure across the wings, which is about a foot less than the average Andean condor wingspan and nearly two feet less than the average of the largest albatrosses and pelicans. Typical weight is , unusually as low as , and length (from bill to tail) is . Females are smaller than males. Bill length can range from . Unlike most storks, the three "Leptoptilos" species fly with the neck retracted like a heron. The marabou is unmistakable due to its size, bare head and neck, black back,
A New Kind of Science of traffic, material fracture, crystal growth, biological growth, and various sociological, geological, and ecological phenomena. Another feature of simple programs is that, according to the book, making them more complicated seems to have little effect on their overall complexity. "A New Kind of Science" argues that this is evidence that simple programs are enough to capture the essence of almost any complex system. In order to study simple rules and their often complex behaviour, Wolfram argues that it is necessary to systematically explore all of these computational systems and document what they do. He further argues that this study should