as for the shapes it is indicated by the roundness of the head that the benefit of that is that it is less susceptible to pests and that its cavity is wider. and the flattening of the back of the stomach the benefit of that is that it is farther away from the backbone so that it is not harmed by its contact with it.
وأما الأشكال فكما يستدل باستدارة الرأس على أن فائدة ذلك أن يقل قبوله للآفات، وأن يكون تجويفه أوسع. وتفرطح مؤخرة المعدة، على أن فائدة ذلك تبعيدها عن الصلب لئلا يتضرر بملاقاته.