a member of the monotremata, an order of primitive egg-laying mammals restricted to australia and new guinea and consisting of only the platypus and the echidna.
单孔「。」'目动物中的一员,是远古蛋生哺乳动物的一目,限生活于澳大利亚和新几内亚地区,只有鸭嘴兽和针鼹种类。
fish, some amphibians and primitive egg-laying mammals such as the duck-billed platypus use similar pits to pick up electric fields generated by nearby animals.
鱼类、有些两栖类以及像鸭嘴兽那种原始产蛋哺乳类动物,都会利用类似的凹陷处来捕捉附近动物产生的电场。
they are the only two egg-laying mammals in the world.
它们是世界上唯一的两种产卵的哺乳动物。