The roc appears in the first edition Monster Manual ( 1977 ) , where it is described as a huge eagle - like bird that inhabits the highest mountains .
The roc preys upon large creatures such as cattle , horses , and elephants .
The roc appears in the first edition Monster Manual ( 1977 ) , where it is described as a huge eagle - like bird that inhabits the highest mountains , and preys upon large creatures such as cattle , horses , and elephants .