Reference for Menachot 213:7

ברזל תניא אחרים אומרים לא יפחות מכליה עורב וכמה אמר רב יוסף אמה על אמה

Of iron it was taught: Others say, He must bring not less than a 'scarecrow'.<span class="x" onmousemove="('comment',' Lit., 'keeping off the ravens'. An iron sheet studded with spikes that was placed on the Temple roof to prevent birds perching there. V. Mid. vhkf IV, 6. According to Aruch: an iron figure placed on the roof to scare the birds away. V. Tosaf. s.v. .');">⁴</span> And how much is that? - R'Joseph said, One cubit square.

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