All birds during the pairing season become more or less sentimental, and murmur soft nothings in a tone very unlike the grinding-organ repetition and loudness of their habitual song. The crow is very comical as a lover; and to hear him trying to soften his croak to the proper Saint-Preux standard has something the effect of a Mississippi boatman quoting Tennyson.

My Study Windows (ed. 1871)