Our results shed new light on the evolution of beak morphology in a non-model species and possibly in other extensive bird species as well. Results A derived long decurved beak in the Ground Tit Length, width and depth of upper beaks from 349 skin specimens were measured for linear analysis...
Deep beaks are presumed to enhance a bird's ability to crack hard seeds, and narrow beaks have been proposed to enhance a bird's efficiency in manipulating seeds.2In the present study, we make the first direct measurements of bite force in Darwin's finches. We used 147 G. fortis from ...
Sexual dimorphism in beak morphology changed from winter to summer due to males having shorter beaks (4.5%) in summer; however, there was little change in female beak measurements. Our study on this Himalayan congener of a widely studied European species can be used to inform studies of the ...
A morphometric approach quantified that the Ground Tit has a comparatively longer and more decurved upper beaks than other parids. We estimated that the ancestor of the Ground Tit likely had a short straight upper beak similar to most current recognized parid species using an ancestral state recon...
(such as the specific bird-related meaning of-billwhen used as a head), which are connected but not identical to the free-word meaning representation (bill) (see Fig.1). In other words, a compound such asstepmotherwould include as a constituent the morphologically transcendedstep-(shared ...
Patterns of correlated evolution among morphology and song are consistent with the hypothesis that beak morphology constrains vocal evolution, with different beak morphologies differentially limiting a bird's ability to modulate vocal tract configurations during song production. These...
Erratum: MOLECULAR PHYLOGENETICS OF THE RAMPHASTOS TOUCANS: IMPLICATIONS FOR THE EVOLUTION OF MORPHOLOGY, VOCALIZATIONS, AND COLORATION potentially effective method to sample bird communities by acting, in effect, as "point counts", recording vocalizations at a given point for a set time... JD W...
Multi-layered bird beaks: a finite-element approach towards the role of keratin in stress dissipation. J R Soc Interface. 2012;9(73):1787–96. doi:10.1098/rsif.2011.0910. Article PubMed PubMed Central Google Scholar Starck JM. Comparative anatomy of the external middle ear of palaeognat...
We observed an increase in minimum song frequency of urban birds, and we also found that the upper frequency limit of songs decreased in direct relation to bill morphology. Conclusions These findings are consistent with the hypothesis that birds with longer beaks and therefore longer vocal tracts ...