نتایج جستجو برای: beak
تعداد نتایج: 1228 فیلتر نتایج به سال:
All living birds are toothless, constituting by far the most diverse toothless vertebrate clade, and are striking examples of evolutionary success following tooth loss. In recent years, an unprecedented number of Mesozoic birds have been described, illustrating the evolution of dentition reductions. Simultaneously, major advances in experimental embryology have yielded new results concerning av...
Ecological character displacement is a process of morphological divergence that reduces competition for limited resources. We used genomic analysis to investigate the genetic basis of a documented character displacement event in Darwin's finches on Daphne Major in the Galápagos Islands: The medium ground finch diverged from its competitor, the large ground finch, during a severe drought. We dis...
To cite: Ozyurek S, Guler F, Turan A, et al. BMJ Case Rep Published online: [please include Day Month Year] doi:10.1136/bcr-2013009309 DESCRIPTION A 16-year-old boy presented to our outpatient clinic with the complaint of right-sided anterior ankle pain for 6 months. The complaints were worse with prolonged physical activity, particularly after running and jumping. There was no history of antec...
We disagree with two of Rendell and Whitehead’s assertions. Culture may be an ancestral characteristic of terrestrial cetacean ancestors; not derived via marine variability, modern cetacean mobility, or any living cetacean social structure. Furthermore, evidence for vocal behavior as culture, social stability, and cognitive ability, is richer in birds than Rendell and Whitehead portray and comp...
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