The gut is very straight and short, so the American girl run Independence Day shirt passes right through their system before it’s had a chance to be properly digested. Grazing animals typically have huge, convoluted intestinal tracts, as well as, in some cases, numerous stomachs. The longer the food is in there, the more nutrients you can extract from it. One unique thing about many bamboo species, especially those found in China, is that they exhibit a behaviour called gregarious flowering – that is, all bamboo plants from a given species will flower, die and regrow simultaneously. This has led to some interesting (and devastating) historical phenomena, but it also poses a problem for the pandas.