The Roman History · Amm. 18.3.9

When the wild geese leave the East because of the heat, and seek a western climate, as soon as they reach Mount Taurus, which is full of eagles, fearing those warlike birds, they stop up their own beaks with stones, that not even the hardest necessity may draw a cry from them; they fly more rapidly than usual across that range, and when they have passed it they throw away the stones, and then proceed more securely.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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