Humans disrupting 66-million-year-old feature of ecosystems

The U-shaped relationship between diet and size in modern land mammals could also stand for "universal," says a new study, which has found that the relationship spans at least 66 million years and a range of vertebrate animal groups. An illustration featuring mammalian herbivores (green), omnivores (purple), invertivores (yellow) and  carnivores (red). Each column includes mammal species lost in the past 2.58 million years (light  shade); those expected to be lost in the near...