Burrowing spine-covered monotreme of Australia having a long snout and claws for hunting ants and termites. 澳大利亚体表有刺的穴居单孔目动物,有长长的口鼻以及用于捕食蚂蚁和白蚁的爪。
Small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family ornithorhynchidae. 澳大利亚和塔斯马尼亚的体毛浓密、水生小哺乳动物,嘴和尾宽阔,脚有蹼;鸭嘴兽科的唯一种类。