. The biology of birds. Birds. 76 THE BIOLOGY OF BIRDS During coasting flight, in gliding or in sailing, there is sometimes an interesting interlocking of the primary feathers, as Trowbridge (1906) demonstrated in hawks. He found that the edges of many of the primaries were. Fig. 18.—The so-called " Flying Dragons," Droco volatis, parachut- ing arboreal lizards of the Far East. From a specimen. The skin is extended on about half-a-dozen elongated and movable ribs. As figure A. shows, the parachute is folded close to the side of the body when the animal is resting. Figure b. shows the
. The biology of birds. Birds. 76 THE BIOLOGY OF BIRDS During coasting flight, in gliding or in sailing, there is sometimes an interesting interlocking of the primary feathers, as Trowbridge (1906) demonstrated in hawks. He found that the edges of many of the primaries were. Fig. 18.—The so-called " Flying Dragons," Droco volatis, parachut- ing arboreal lizards of the Far East. From a specimen. The skin is extended on about half-a-dozen elongated and movable ribs. As figure A. shows, the parachute is folded close to the side of the body when the animal is resting. Figure b. shows the parachute expanded as the animal leaps. firmly interlocked. This makes the outer portion of the wing more rigid when the bird is using it as a vol-plane and it keeps the primaries partly extended without muscular Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Thomson, J. Arthur (John Arthur), 1861-1933. New York : Macmillan
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbirds, bookyear1923
