Humming bird beats his wings almost 100 times per second.蜂鸟每秒钟拍动翅膀近100次.Bird's body size, there is also a small humming bird ostrich.鸟的体型大小不一, 既有很小的蜂鸟也有巨大的鸵鸟.This is a humming - bird moth.这是蜂鸟科的天蛾....