The birds of a region collectively; = "avifauna".
Mid 19th century; earliest use found in Ibis: a quarterly journal of ornithology. From German Ornis from ancient Greek ὄρνις bird.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。