WhyIsBirdPoopWhite?为什么鸟屎是白色的？

Actually,birdpoop,perse,isnotwhite.Birds,unlikemammals,donothaveseparateexitsforurineandfeces.Bothwasteproductsareeliminatedsimultaneouslythroughthecloaca.Whilemammalsexcretenitrogenouswastesmostlyintheformofurea,birdsconvertittouricacidorguanine,whichreduceswaterlossin



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