1298年のポーロのロック鳥に関する記述のほか、周去非(Zhōu Qùfēi)は1178年の著書『霊鷲大陀』で、アフリカ沖の大きな島には、羽を貯水池として使えるほど大きな鳥がいると述べている<ref>In Search of the Red Slave , Pearson & Godden , 2002 , isbn:0750929383 , pages121</ref>。ラフィア椰子の葉は、ロック鳥の羽という名目でクビライ・ハーンの元に持ち込まれた可能性がある<ref>Yule's ''Marco Polo'', bk. iii. ch. 33, and ''Academy'', 1884, No. 620.</ref><ref>Attenborough, D. (1961). ''Zoo Quest to Madagascar''. Lutterworth Press, London. p.32-33.</ref>。
最近の学者<sup>(''誰?'')</sup>の中には、伝説のロック鳥をニュージーランドのハーストワシと比較する人もいる。体長1.4m、翼を広げると3mもあり、15世紀頃に絶滅したが、おそらくマオリの''テ・ホキオイ''(Te Hokioi)または''テ・ハカワイ''(Te Hakawai)の伝説に影響を与えたと思われる<ref>http://nzbirds.com/birds/haasteagle.html , New Zealand Birds , 2010-07-09</ref>。。テ・ハカワイは色鮮やかな巨大な鳥で、時折地上に降りてきては人間を食べていたが、普段は人知れず雲の中で暮らしていた、という伝説がある。
This was said to be a colorful huge bird which (in some versions of the legend) had occasionally descended to Earth to carry off humans to eat, but generally lived in the clouds unseen. Only its cry, after which it was named, could be heard. Indeed, the ''hokioi'' seems to be a composite mythical beast inspired by actual animals, just like the roc appears to have been. In the 1980s, it was found<ref>Miskelly (1987), Galbreath & Miskelly (1988)</ref> that male ''[[Coenocorypha]]'' snipes, tiny [[nocturnal]] [[wader]]s, produce an unexpectedly loud [[Drumming (snipe)|roaring sound]] with their tails during mating flights. The supposed coloration of the ''hokioi'' is not matched by any known bird, and generally would be extremely unusual for a bird of prey. Thus, as it seems likely that the ''hokioi'' was the eerie "drumming" of the snipes, explained with the ancestor's tales about the giant eagles which they still knew from living memory.
==Religious tradition==