THE most recent evidence to shed light on the evolution of flight in birds is described by Sanz et al. on page 442 of this issue — their remarkable discovery of the first example of a preserved alula, or bastard wing, in a 125-million-year-old bird from the Lower Cretaceous of Spain...
aAerial Righting, Directed Aerial Descent, and Maneuvering in the Evolution of Flight in Birds 空中纠正,被指挥的空中下降和操纵在飞行的演变在鸟[translate]
Voted Best Book of 2002 by Readers of Prehistoric Times Magazine Dinosaurs of the The Evolution and Loss of Flight in Dinosaurs and Birds presents the most recent work of renowned evolutionary scientist and dinosaur illustrator Gregory Paul. Dinosaurs of the Air synthesizes the growing body of evid...
2. 进化(evolution) 对于进化方面就是鸟类的翅膀(wing)了,有的认为为了飞行(flight)而进化,有的认为是为了隔热(heat insulation)和给身体保暖(thermal)而进化(evolve)。 3. 飞行(flight) 鸟类能够飞行的原因主要有以下: ①鸟类身体...
In recent years, new fossil discoveries have changed our view of the early evolution of birds and, more critically, their powers of flight. We now know about a number of small-bodied dinosaurs that had feathers on their wings as well as on their legs and tails: completely unique in the ...
The evolution of flight in birds. This interactive module for grades 9–12 examines evidence from the fossil record, behavior, biomechanics, and cladistic analysis to interpret the sequence of events that led to flight in the dinosaur lineage. http://www.ucmp.berkeley.edu/education/explorations/...
evolution of flight in birds (Agosta and Klemens, 2008); (2) the correlated evolution of traits that preadapt organisms to novel conditions. This involves selection for parallel changes in multiple traits rather than a single one (for instance, physiological and morphological characteristics), which...
Secondary flightlessness has evolved independently many times in birds. Morphological changes in the pectoral girdle and flight feathers and changes in body size have been associated with the evolution of flightlessness, and it has also been suggested that flightless birds have relatively small brains....
Whatever its precursors, Archaeopteryx is regarded as a bird and to interpret adequately such evidence as we have we must consider it in relation to what we know of birds as well as reptiles.doi:10.1038/263762a0HARRISONC. J. O.Nature
The asymmetrical flight feathers of their wings are among the most distinctive features of living birds. But how are these feathers actually constructed, and when did they first appear in evolutionary history? New Yale research,published February 11 in Proceedings of the Royal Society B, found subt...