By Sy Montgomery

Meet the women: a flock of clever, affectionate, hugely individualistic chickens who stopover at their favourite pals, devise alternative ways to conceal from foxes, and mob the writer like she’s a rock big name. In those pages you’ll additionally meet Maya and Zuni, orphaned child hummingbirds who hatched from eggs the scale of army beans, and who're little greater than air bubbles fringed with feathers. Their lives grasp precariously within the balance—but with human support, they could someday overcome the sky.

Snowball is a cockatoo whose dance video went viral on YouTube and who’s now instructing schoolchildren tips to dance. You’ll meet Harris’s hawks named fireplace and Smoke. And you’ll come to grasp and love a bunch of alternative avian characters who will switch your brain perpetually approximately who birds fairly are.

Each of those birds exhibits a special and completely striking point of what makes a fowl a bird—and those are the teachings of Birdology: that birds are a long way stranger, extra wondrous, and while extra like us than we would have dared to visualize. In Birdology, liked writer of The sturdy sturdy Pig Sy Montgomery explores the essence of the otherworldly creatures we see each day. in terms of her adventures with seven birds—wild, tame, unique, and common—she weaves new clinical insights and narrative to bare seven kernels of chicken knowledge.

The first lesson of Birdology is that, irrespective of how universal they're, Birds Are participants, as every one of Montgomery’s particular women in actual fact indicates. within the leech-infested rain wooded area of Queensland, you’ll come nose to nose with a cassowary—a 150-pound, man-tall, flightless poultry with a helmet of bone on its head and a slashing razor-like toenail with which it (occasionally) eviscerates people—proof that Birds Are Dinosaurs. You’ll study from hawks that Birds Are Fierce; from pigeons, how Birds locate Their approach domestic; from parrots, what it implies that Birds Can speak; and from 50,000 crows who moved right into a small city’s downtown, that Birds Are in all places. they're the winged extraterrestrial beings who encompass us.

explains simply how very "other" birds are: Their hearts appear like these of crocodiles. they're lined with converted scales, that are known as feathers. Their bones are hole. Their our bodies are permeated with wide air sacs. they've got no fingers. they provide beginning to eggs. but regardless of birds’ and humans’ disparate evolutionary paths, we percentage emotional and highbrow skills that permit us to speak or even shape deep bonds. once we start to understand who birds fairly are, we deepen our potential to method, comprehend, and love those otherworldly creatures. And this, eventually, is the necessary lesson of Birdology: it communicates a heartfelt fascination and awe for birds and restores our connection to those complicated, mysterious fellow creatures.

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Extra resources for Birdology: Adventures with a Pack of Hens, a Peck of Pigeons, Cantankerous Crows, Fierce Falcons, Hip Hop Parrots, Baby Hummingbirds, and One Murderously Big Living Dinosaur (t)

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At any rate, when cosmologists speak of the cosmic ‘mass density’, it is significant they make it constitute only around a third of the whole, including in it only baryonic and dark matter (see, for example, Peebles and Ratra, 2003). It does not include dark energy. Also, the implications of the term ‘vacuum’ ought not to be forgotten: it presumably means that the relevant space is ‘empty’. Empty of what? Presumably of rest mass. To all appearances, dark energy as a property of the vacuum would have been present in the ‘vacuum’ even if there had never been any rest mass at all.

2 Phase two: transformation The seventeenth century marked a transformation in the concept of matter; one in which the burgeoning science of mechanics played the principal role. With the shift of focus from the world of living things to the more generic topic of bodies in motion came the rejection of the Aristotelian category of substance that had depended so much on the organism as paradigm. And with the disappearance of substantial form came the removal of the barrier to regarding change as involving ‘stuff’ with specific properties.

There are clearly quantitative constraints on such a change; the quantity of some ‘stuff’ otherwise indeterminate must be conserved. Richard Swineshead suggested, on intuitive grounds, that the quantity of this stuff, the quantity of matter, should be proportionate to the volume as well as to the density of the body concerned: the defi nition that Newton would later adopt as his own. Parallel to this but in the very different context of motion, Jean Buridan postulated an ‘impetus’ in the case of moving bodies that is conserved in unimpeded motion and is a measure of resistance to change of motion.

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