In Rome several thousand lions were quartered at times in various arenas, and frequently in the night-time they approached the grating, and, leaning their gigantic heads against it, gave utterance to their yearning for freedom and the desert. Thus they began on this occasion, and, answering one another in the stillness of night, they filled the whole city with roaring. There was something so indescribably gloomy and terrible in those roars.
From Henryk Sienkiewicz in Quo Vadis.