The key, they found, is the acrocoracohumeral ligament, a short band of tissue that connects the humerus to the shoulder joint [image]. The ligament balances all of the converging forces, from the pull of the massive pectoralis muscle in the bird's breast to the push of wind under its wings. … [Read more...] about One Key to Bird Flight Discovered
Reptiles, for example, originally encompassed lizards, snakes, turtles and crocodiles. Birds were considered distinct. Over time, however, scientists found that crocodiles were more closely related to birds than either of them were to other reptiles. (This was found first via morphological studies but later well-confirmed via molecular analysis, Baum said.) This left taxonomists in a quandary about what the grouping "reptile" should refer to, as one of its core members was now seen to be more closely related to an outsider, Baum said. … [Read more...] about What is taxonomy?