Results 11 to 20 of about 1,653,876 (262)

Beak shape and nest material use in birds. [PDF]

Philos Trans R Soc Lond B Biol Sci, 2023
The evolution of behaviour can both influence, and be influenced by, morphology. Recent advances in methods and data availability have facilitated broad-scale investigations of physical form and behavioural function in many contexts, but the relationship between animal morphology and object manipulation—particularly objects used in construction—remains
Sheard C, Street SE, Evans C, Lala KN, Healy SD, Sugasawa S.   +5 more
europepmc   +7 more sources

The multifactorial nature of beak and skull shape evolution in parrots and cockatoos (Psittaciformes) [PDF]

BMC Evolutionary Biology, 2019
Background The Psittaciformes (parrots and cockatoos) are characterised by their large beaks, and are renowned for their ability to produce high bite forces.
Jen A. Bright, Jesús Marugán-Lobón, Emily J. Rayfield, Samuel N. Cobb   +3 more
doaj   +9 more sources

Unravelling the phylogenetic and ecological drivers of beak shape variability in cephalopods [PDF]

Reviews in Fish Biology and Fisheries, 2022
AbstractCephalopod beaks are essential for prey acquisition and fragmentation during feeding. Thus, it is expected that ecological pressures affect cephalopod beak shape. From a practical perspective, these structures are also used to identify gut contents of marine megafauna, such as toothed whales, sharks, seabirds, and large pelagic fishes. Here, we
Antoni Sánchez-Márquez, Joan Navarro, Antigoni Kaliontzopoulou, Marc Farré, Morag Taite, Oscar Escolar, Roger Villanueva, A. Louise Allcock, Fernando Á. Fernández-Álvarez   +8 more
openaire   +3 more sources

Fit for purpose? Analysis of the relationship between skull, beak shape and feeding ecology in Psittaciformes [PDF]

Journal of Anatomy
Abstract Psittaciformes have a broad distribution across the southern hemisphere, and this wide ecological range is coupled with high levels of morphological diversity, particularly in the skull and beak structure, which has been previously linked to diet and body size.
Gregory Sutton, Denis Charles Deeming, Shannon Harrison   +2 more
exaly   +4 more sources

Northeastern Pacific Octopus Beak Shape for Species-Level Detection

Malacologia, 2022
Cephalopods have upper and lower chitinous beaks, and their shape can be used to identify species. However, the morphological attributes of beaks are commonly obtained from sources that contain little information on shape, compromising the determination of taxa.
Diaz-Santana-Iturrios, Mariana, Zepeda-Benitez, Viridiana, Pacheco-Ovando, Renata, Cornejo, Claudio F., Miguel Cerda, Jose, Augusto Salinas-Zavala, Cesar, Granados-Amores, Jasmin   +6 more
openaire   +3 more sources

Avian magnetoreception: elaborate iron mineral containing dendrites in the upper beak seem to be a common feature of birds. [PDF]

PLoS ONE, 2010
The magnetic field sensors enabling birds to extract orientational information from the Earth's magnetic field have remained enigmatic. Our previously published results from homing pigeons have made us suggest that the iron containing sensory dendrites ...
Gerald Falkenberg, Gerta Fleissner, Kirsten Schuchardt, Markus Kuehbacher, Peter Thalau, Henrik Mouritsen, Dominik Heyers, Gerd Wellenreuther, Guenther Fleissner   +8 more
doaj   +2 more sources

Genomic contingencies and beak shape variation in a hybrid species [PDF]

, 2017
Abstract Hybridization is increasingly recognized as a potent evolutionary force. Though additive genetic variation and novel combinations of parental genes theoretically increase the potential for hybrid species to adapt, few empirical studies have investigated the adaptive potential within a hybrid species. Here, we
Runemark, Anna, Fernández, Laura Piñeiro, Eroukhmanoff, Fabrice, Sætre, GlennPeter   +3 more
openaire   +2 more sources

Digest: Evolution of shape and leverage of bird beaks reflects feeding ecology, but not as strongly as expected* [PDF]

Evolution, 2019
Is feeding ecology the main driver of beak diversification in modern birds? Taking a broad-scale interspecific comparative approach, Navalon et al. (2019) found a relationship between feeding ecology (diet and feeding behavior) and beak morphology (shape and leverage), although much of the observed variation remained unexplained.
Sam Van Wassenbergh, Simon Baeckens
openaire   +4 more sources

Effects of beak-treatment styles on beak morphology and production performance of layer chicks aged 0–8 weeks

Frontiers in Veterinary Science
IntroductionDouble-infrared (IR-D) and laser energy sources (LAS) are two types of newly beak treatment equipment. Although the IR-D and LAS techniques have been developed by changing the number and type of energy sources, their effects on layer chicks ...
Lin Duan, Xiao-Yu Zhao, Er-Ying Hao, Chuan-Wen Wang, De-He Wang, Hui Chen, Zhong-Qiang Wang, Li-Jun Xu, Ke-Qian Di   +8 more
doaj   +3 more sources

Geometric morphometric analysis of beak shape of Columbimorphae (Columbas, Van, Mardin and Dönek)

Anatomia, Histologia, Embryologia
AbstractSelective breeding over centuries has led to the emergence of numerous pigeon breeds from the single species Columba livia, showcasing unparalleled phenotypic diversity. In Eastern Turkey, Van pigeons originate, while Tumbler pigeon varieties thrive countrywide, reflecting local traditions.
Ozkan, Ermis, Gunay, Ebuderda, Deveci, Emine Irem, Manuta, Nicoleta, Cakar, Buket   +4 more
openaire   +3 more sources