“飞鸟”的英语可以翻译为：flyer ...

灰白的天空中满是迁徙的飞鸟。Migrating birds filled the pale sky.他张弓搭箭能射落空中的飞鸟.He was able to shoot down a flying bird with the bow and arrow.飞鸟的歌声听着也有点瘆人.And the music of the fluttering birds had an eerie lilt to it....