Man has built huge airplanes. But how much more versatile are the birds, including the hummingbird, which weighs less than an ounce [30 gm]!
اما واقعاً کارآیی پرندگان ،‏ از جمله مرغ مگس که وزنی کمتر از ۳۰ گرم دارد ،‏ چقدر بیشتر است !‏