大方廣圓覺修多羅了義經略疏 2.65

2.65

三惡報也。無畜生者，取其文潤成句，以二例知。亦可翻譯傳寫脫漏，義必合有。故《華嚴》云：「十不善業道，上者地獄因，中者畜生因，下者餓鬼因。」

These are the retributions of the three evil destinies. The omission of animals is done to embellish the prose into phrasing, using the two to illustrate the third. Or perhaps there was an omission in translation or transcription, for the meaning must include them. Therefore, the Huayan [Sūtra] says: 'The paths of the ten non-virtuous actions: the superior cause rebirth in hell, the middling cause rebirth as animals, and the inferior cause rebirth as hungry ghosts.'