Monotreme/单孔类 卵生的哺乳动物 duckbill 鸭嘴兽 Figure 15-21 Two present-day monotremes: the duck-bill platypus of Australia and Tasmania (A) and the spiny anteater of Australia (B) B Anteater 食蚁兽Monotreme/单孔类 卵生的哺乳动物 Anteater /食蚁兽 duckbill /鸭嘴兽