By David Allen Sibley
It is a PDF with OCR textual content - if someone prefers the unique DJVU with OCR, ship me a message and I'll add that as well.
The Sibley advisor to poultry existence and Behavior is the hot landmark publication from David Allen Sibley. Designed to reinforce the birding event and to counterpoint the preferred learn of North American birds, the booklet combines greater than 795 of his full-color illustrations with authoritative textual content via forty eight specialist birders and biologists. during this new consultant Sibley takes us past id, to teach us how birds dwell and what they do.
Introductory essays define the foundations of avian evolution, existence cycle, physiology, flight dynamics, and extra. The eighty family-by-family chapters describe the superb variety of habit dictated by means of birds’ biology and atmosphere. one of the topics coated and illustrated are:
--molts and plumages
--habitats
--food and foraging
--vocalizations and displays
--courtship and breeding
--rearing of young
--migration and movements
--scientific groupings
--introduced species
--accidental species
--anatomy
--flight styles
--nests and eggs
--conservation
--global distribution
Accessibly written, fantastically designed and arranged, and brilliantly illustrated, The Sibley advisor to chicken existence and Behavior is an vital resource of knowledge at the avian lifestyles round us.
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Additional info for The Sibley Guide to Bird Life and Behavior
Example text
Despite their smaller size, however, bird lungs weigh as much as those of mammals of similar size, and they function much more effi ciently. Each time a bird breathes, it replaces nearly all the air from the prior breath, whereas in mammals a signifi cant amount of air remains in the lungs. Unlike mammals, birds are equipped with a series of internal air sacs con nected to the lungs. These air sacs can occupy up to 20 percent of the body cav ity, including some of the space within large, hollow bones.
Birds have only one bone, the columella, for trans mitting sounds, versus three in mammals, but acuity does not appear to suffer. Avian hearing is best developed in nocturnal birds, which use hearing for hunting as well as communicating. A Barn Owl (Tyto alba) can capture a mouse in total darkness based on sound alone, but humans are nearly as adept at track ing horizontal movements in the dark. The Barn Owl excels as a mouser because it can also track movement in the verti cal dimension-a capacity that guides the owl's descent as it swoops in for a kill.
The internal structure of the avian ear is simpler than that of mammals. Birds have only one bone, the columella, for trans mitting sounds, versus three in mammals, but acuity does not appear to suffer. Avian hearing is best developed in nocturnal birds, which use hearing for hunting as well as communicating. A Barn Owl (Tyto alba) can capture a mouse in total darkness based on sound alone, but humans are nearly as adept at track ing horizontal movements in the dark. The Barn Owl excels as a mouser because it can also track movement in the verti cal dimension-a capacity that guides the owl's descent as it swoops in for a kill.