Feko esas mi-solida restajo de animalo digestiva sistemo ekpulsas tra anuso (o kloako) dum fekifo.
En homaro fekifo esas facar de du o tri foye per dio til uno foye omna du o tri dia. Hardiginta di feko povas kozar plulongigita interrupto en l'ordinara rutino ed esas nominita konstipeso.
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