Michael J. Benton

One of the better if not one of the best books I have read about recent dinosaur discoveries and theories. The chapters regarding dinosaur color, breathing, brains and behavior, and dinosaur growth and eating are some of the most interesting. As some of these recent discoveries have been published I have read about them on Science Daily, but this book comprehensively puts them into perspective and explains all the science behind the theories.

The book more or less ends with a chapter about the K-T boundary asteroid impact and the extinction of dinosaurs. Again, a very comprehensive explanation of the science and how what was a controversial theory in 1980 is now generally accepted as fact.

Overall, however, this book is about how paleontology has become a more testable science because of recent advances in engineering, data science and other technologies.… (más)

Benton does a good job explaining how modern dinosaur research works, including debates and some mistakes.

> That’s why we can confidently describe the form and function of the eyeball of T. rex – not because of random comparisons with lions or sharks, but because crocodiles and birds, which bracket the dinosaurs in the evolutionary tree, share most features of eye structure and function.

> Black-brown melanin is packed into sausage melanosomes, ginger melanin into ball melanosomes. We saw this in bird feathers, and it was always the same. It’s also true of all mammals, including humans. In the evolutionary tree, dinosaurs, and most other extinct reptiles, are bracketed by birds and mammals, so this is a universal relationship

> This was the first dinosaur ever to be able to chew its food. Other dinosaurs had simply grabbed and swallowed, but by chewing its food, Iguanodon could extract much more goodness from every mouthful. It did not chew the food as we do, by rotating the lower jaw around the pivot at the back, but more by a mechanism that allowed the lower jaw to chop up into the upper jaws, a little like the blade of a penknife shutting into the handle.

> It was a combination of many small offspring and small eggs but no parental care; small head and no chewing; and bird-like lungs, which processed oxygen pick-up more efficiently than reptile and mammal lungs. These characteristics allowed sauropods to achieve huge size for minimal food intake – probably as much as an elephant, or even less, for a body that was ten times as large. They achieved steady body temperature by being huge, not by eating lots and having complex inner furnaces, as elephants and humans do.

> The most successful dinosaurs in terms of sheer numbers of individuals were the plant-eating hadrosaurs, commonly called duck-billed dinosaurs, because their long, horse-like skulls expanded at the front into a broad toothless structure, like a duck’s bill. Hadrosaurs have been called the ‘sheep of the Cretaceous’, and in places, especially in North America and Mongolia, collectors often find hundreds of specimens together. Hadrosaurs had a remarkably standard skeleton and skull, but showed great diversity in their extraordinary head crests, different in each species. It’s their teeth, however, that seem to have made them so successful. … Hadrosaurs were successful even though – or maybe because – they tackled tough kinds of vegetation that, perhaps, other plant-eating dinosaurs could not manage. In effect they had bionic teeth, built like a steel rasp, and endless tooth replacement, so they could afford to let their teeth wear down quickly and then shed them.

> There have been some studies on dinosaurian tooth wear, but they have been disputed. For example, the orientations of sets of scratches on the teeth in hadrosaurs were used to confirm the principal motions of jaw action, but older papers that sought to identify the precise diet from such scratches are now generally disavowed.

> In the Cretaceous, North America was divided into two land masses, one to the east and one to the west of the Western Interior Seaway, which ran up through Mexico and Texas to Alberta and Northwest Territories. Martin Lockley, famed dinosaur track enthusiast, born in England but a long-time resident of Colorado, identified a number of what he called dinosaur megatracksites, locations with thousands of footprints, mostly in the form of trackways, on the western coastline of this inland sea. The megatracksites documented how herds of dinosaurs trekked north and south, perhaps covering 2,000–3,000 kilometres (around 1,250–1,850 miles) in a season, in search of lush vegetation.… (más)