叉叉

• The avian brain is as complex , flexible and inventive as any mammalian brain , they argue , and it is time to adopt a more accurate nomenclature that reflects a new understanding of the anatomies of bird and mammal brains
  专家说，鸟类的大脑和任何哺乳动物的大脑一样，是复杂灵活具有创造性的。乌鸦不仅会用小树枝的钩钩叉叉来觅食，有些还学会了把胡桃衔到公路上，让过往的汽车把胡桃碾碎，然后享用胡桃仁。