Three- and six-headed "zmei" slain by the titular hero in "Ivan Popyalov" (. "Ivan Cinders". Afanasyev's tale #135) appear as six-, nine-, and twelve-headed Chuda-Iuda in the cognate tale #137 "Ivan Bykovich" (). The inference is that Chudo-Yudo must also be a dragon, even though the word "serpent" ("zmei") does not appear explicitly in the latter tale. The six-, nine-, and twelve-headed Chuda-Yuda that appear out of the Black Sea are explicitly described as "zmei" in yet another cognate tale, #136 "Storm-Bogatyr, Ivan the Cow's Son" (). The Storm-Bogatyr is in possession of a magic sword (Sword Kladenets), but uses his battle club (or mace) to attack them.