Sifa kuu ya wanyama ni kuzaa na kunyonyesha ingawa wapo wengine ambao wana sifa za kipekee.
Leo tuwaangalie kwa undani kidogo aina ya wanyama ambao wao tofauti na wengine hutaga mayai(Egg-laying mammals).
Hizi ni species mbili ambazo wanasayansi wamewaweka kila mmoja kwenye familia yake...
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