. . "Stone raven"@en . "The stone ravens were a species from Clematis that had a warbling whistle. Some of the birds on Beowulf reminded Alfred Harrington of them. (HHA6.3: BATB)"@en . "The stone ravens were a species from Clematis that had a warbling whistle. Some of the birds on Beowulf reminded Alfred Harrington of them. (HHA6.3: BATB)"@en .