The past 15 year feeding records of one male Baiji was analyzed and a daily energy requirement moldel for the Baiji's early rearing years was set to be: DER(C) =9 860ln( A )+10.433( R 2 =0.9472).The energy density of carcass,basal metabolic rate, cost of locomotion,and cost of thermoregulation of the Baiji were estimated based on the energetics of other marine mamals. The two models for the Baiji's daily energy requirement in wild were developed. One was for the female: DER(F) =10 848ln( A )+8...