Download Cow (Animal) by Hannah Velten PDF

By Hannah Velten

From the milk we drink within the morning, to the leather-based sneakers we slip on for the day, to the steak we enjoy at dinner, our day-by-day lives are completely sure up with cows. but there's a way more complicated tale in the back of this probably benign creature, which Hannah Velten explores right here, plumbing the wealthy trove of delusion, truth, and legend surrounding those familar animals.

From the plowing box to the rodeo to the temple, Velten tracks the continually altering social dating among guy and farm animals, starting with the domestication of aurochs round 9000 BCE. From there, Cow launches right into a interesting tale of non secular fanaticism, clinical exploits, and the industrial modifications engendered by means of the exchange of the various items derived from the animal. She explores in enticing aspect how regardless of cattle's prominence at ends of a large spectrum: Hinduism venerates the cow as essentially the most sacred contributors of the animal nation, whereas red meat is a prized staple of the yankee nutrition. inspiration scary and informative, Cow restores this oft-overlooked animal to the the Aristocracy it richly merits.

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C o n e Cells and Pigments Cone cells of reef fishes, as in other teleosts, are ordered into a definable mosaic pattern. The arrangement usually consists of a row or square pattern consisting of double and single cones (Munz and McFarland, 1973). in many species the double cones are identical twin cones, whereas the singles consist of one or two types. The exact function of this ordered mosaic remains unclear, although the arrangement may serve to enhance motion detection. The two members of double cones often contain the same visual pigment but may contain spectrally different pigments (Loew and Lythgoe, 1978; Levine and MacNichol, 1979).

The eyeshine from reef croakers, pempherids, and especially priacanthids, as created by reflections from a diver's light, provides a vivid display of the importance of tapeta in enhancing photon catch. By almost doubling the chance of absorption, the presence of a tapetum could, for example, increase the photon catch during starlight and, perhaps, make vision useful even during overcast nights. It is not clear whether nocturnal planktivores silhouette their prey against the "brighter" downwelling light from the surface (see Hobson, Chapter 4, for a discussion).

How has the evolution of the reef fish fauna contributed to the present-day assemblage? Recent work in phylogenetics, paleontology, and marine geology has provided opportunities to resolve these questions (Sale, 1988b). We identify three main requirements in the development of an evolutionary and historical perspective on reef fish biology. First, it demands a working definition of what is meant by a reef fish. To do this we need more comprehensive descriptions of the fishes and their habitats.

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