Nigbamiran, won maa n toju awon ebi ati eye miran bi ebi yii.. 
Ní àwọn ẹranko tó lè bímọ, ìyípo urea máa ń ṣẹlẹ̀ nínú ẹ̀dọ, bíi díẹ̀ máa ń ṣẹlẹ̀ nínú kíòmìnira.iṣẹ́ rẹ̀ àwọn oun ẹlẹ́mí tí kò rọrùn fún láti yọ ammonia kúrò lára máa ń soo di àwọn nkan míràn bíi urea tàbí uric acid, tí kò ní máje púpọ̀.. 