Download The Unfeathered Bird by Katrina van Grouw PDF

By Katrina van Grouw

There is extra to a chook than just feathers. And simply because birds developed from a unmarried flying ancestor doesn't suggest they're structurally the entire similar. With over 385 attractive drawings depicting two hundred species, The Unfeathered Bird is a richly illustrated ebook on chook anatomy that gives refreshingly unique insights into what is going on underneath the feathered floor. every one beautiful drawing is made up of a precise specimen and reproduced in luxurious huge structure. The birds are proven in practical positions and engaged in habit regular of the species: an underwater view of the skeleton of a swimming loon, the musculature of a porpoising penguin, and an unfeathered sparrowhawk plucking its prey. Jargon-free and simply available to any reader, the vigorous textual content relates birds' anatomy to their way of life and evolution, analyzing such questions as why penguins are greater than auks, even if harrier hawks fairly have double-jointed legs, and the adaptation among wing claws and wing spurs. A landmark in well known poultry books, The Unfeathered Bird is a needs to for someone who appreciates birds or poultry art.

  • A exact ebook that bridges paintings, technology, and heritage
  • Over 385 appealing drawings, artistically prepared in a luxurious large-format publication
  • Accessible, jargon-free text--the merely booklet on chook anatomy geared toward the final reader
  • Drawings and textual content all in keeping with genuine poultry specimens
  • Includes so much anatomically unique poultry teams
  • Many species by no means illustrated ahead of

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Sample text

But what gives them their intimidating glare is their overhanging “eyebrows”; ridges made of two adjoining plates of bone that protrude from the skull and may serve to protect the eyes from damage while pursuing prey. In some groups, however, including the Osprey, honey buzzards, Bat Hawk, and a few of the insectivorous kites, there is only a single, small projection, a possible indication of their more primitive ancestry. Eyesight is the primary sense used in hunting, and it is formidably well developed, especially in fine focusing over vast distances and in the detection of movement.

32 Black Vulture Coragyps atratus King Vulture Sarcoramphus papa Skulls of New World vultures. On both sides of the Atlantic there is a division of labor between the large, thick-­billed tearers of flesh and the smaller, narrow-­billed pickers of scraps. Both will feed amicably from the same carcass, thereby keeping competition to a minimum. The scrap-­pickers can use their thin bill to remove the finest shreds of meat and probe inside bones to get to the marrow. The more aloof and solitary Lammergeier in the Old World habitually eats the bones, too, and has particularly acidic digestive juices to deal with them.

In the long gliding wing of albatrosses and other seabirds, the feathers arising from the skin overlying the humerus may be enlarged to form a wing vane more or less continuous with the secondaries. These are not true flight feathers, however: all secondaries, including the tertials, originate at the ulna and are attached to the bone. In many bird families, including the pigeons and nightjars pictured here, a slight gap exists between the fourth and fifth secondaries, with an extra covert feather overlying the gap almost as though a feather were missing.

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