PSl. *krukъ m. 'raven'. "Probably of onomatopoetic origin, cf. OPl. krukacì 'roar'." (RD). Rick Derksen. "krukъ" in: Etymological Dictionary of the Slavic Inherited Lexicon. Indo-European Etymological Dictionaries Online. Edited by Alexander Lubotsky. Brill, 2014. Brill Online. April 17, 2014. < http://iedo.brillonline.nl/dictionaries/lemma.html?id=19190 >, Lith. kranklys m. 'raven'
Robert Farren, PIE culture words collection, 2017
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