I have always loved the big birds, Great Blue Heron, Great Egret, and others, and especially when they show their wingspread. It reveals the intricate details of the way they are made. They are marvels of flight and are perfect for it. They can glide with such beauty. And it is amazing that these large birds weigh only five pounds or so. Human designers can only copy the wisdom seen in nature to improve their own creations for flight.