Results 11 to 20 of about 44,293 (251)

The flight feather moult pattern of the bearded vulture (Gypaetus barbatus). [PDF]

Journal of Ornithology, 2016
Moult is an extremely time-consuming and energy-demanding task for large birds. In addition, there is a trade-off between the time devoted to moulting and that invested in other activities such as breeding and/or territory exploration. Moreover, it takes
A Adam, A Hedenström, A Margalida, A Margalida, B Erni, C Edelstam, C Hemborg, CP Hickman, DC Houston, E Stresemann, F Daunt, F Hiraldo, H Pietiäinen, I Newton, I Zuberogoitia, I Zuberogoitia, I Zuberogoitia, JA Gil, JA Sesé, JE Brommer, KP Burnham, LG Underhill, LG Underhill, M Cieslak, M Herremans, MS Foster, MW Dietz, NE Langston, NFR Snyder, P López-López, P López-López, P Pyle, P Pyle, PJ Mundy, RHM Espie, RJ Antor, RM Chandler, S Rohwer, S Rohwer, V Penteriani, VG Rohwer, WAI Calder, WS Clark, Y Barshep   +43 more
core   +4 more sources

Sonic hedgehog specifies flight feather positional information in avian wings. [PDF]

Development, 2020
ABSTRACT Classical tissue recombination experiments performed in the chick embryo provide evidence that signals operating during early limb development specify the position and identity of feathers. Here, we show that Sonic hedgehog (Shh) signalling in the embryonic chick wing bud specifies positional information required for the ...
Busby L, Aceituno C, McQueen C, Rich CA, Ros MA, Towers M.   +5 more
europepmc   +7 more sources

Rachis morphology cannot accurately predict the mechanical performance of primary feathers in extant (and therefore fossil) feathered flyers [PDF]

Royal Society Open Science, 2017
It was previously suggested that the flight ability of feathered fossils could be hypothesized from the diameter of their feather rachises. Central to the idea is the unvalidated assumption that the strength of a primary flight feather (i.e. its material
John Lees, Terence Garner, Glen Cooper, Robert Nudds   +3 more
doaj   +1 more source

Flight feather moult drives minimum daily heart rate in wild geese. [PDF]

Biol Lett, 2018
Waterfowl undergo an annual simultaneous flight-feather moult that renders them flightless for the duration of the regrowth of the flight feathers. In the wild, this period of flightlessness could restrict the capacity of moulting birds to forage and escape predation. Selection might therefore favour a short moult, but feather growth is constrained and
Portugal SJ, White CR, Green JA, Butler PJ.   +3 more
europepmc   +4 more sources

The Making of a Flight Feather: Bio-architectural Principles and Adaptation. [PDF]

Cell, 2019
The evolution of flight in feathered dinosaurs and early birds over millions of years required flight feathers whose architecture features hierarchical branches. While barb-based feather forms were investigated, feather shafts and vanes are understudied.
Chang WL, Wu H, Chiu YK, Wang S, Jiang TX, Luo ZL, Lin YC, Li A, Hsu JT, Huang HL, Gu HJ, Lin TY, Yang SM, Lee TT, Lai YC, Lei M, Shie MY, Yao CT, Chen YW, Tsai JC, Shieh SJ, Hwu YK, Cheng HC, Tang PC, Hung SC, Chen CF, Habib M, Widelitz RB, Wu P, Juan WT, Chuong CM.   +30 more
europepmc   +4 more sources

Flight performance and feather quality: paying the price of overlapping moult and breeding in a tropical highland bird. [PDF]

PLoS ONE, 2013
A temporal separation of energetically costly life history events like reproduction and maintenance of the integumentary system is thought to be promoted by selection to avoid trade-offs and maximize fitness.
Maria Angela Echeverry-Galvis, Michaela Hau   +1 more
doaj   +1 more source

Effects of clipping of flight feathers on resource use in Gallus gallus domesticus

Royal Society Open Science, 2022
Ground-dwelling species of birds, such as domestic chickens (Gallus gallus domesticus), experience difficulties sustaining flight due to high wing loading.
Renée Garant, Bret W. Tobalske, Neila BenSassi, Nienke van Staaveren, Dan Tulpan, Tina Widowski, Donald R. Powers, Alexandra Harlander-Matauschek   +7 more
doaj   +1 more source

Feather-inspired flow control device across flight regimes

Bioinspiration & Biomimetics, 2023
Abstract Bio-inspired flow control strategies can provide a new paradigm of efficiency and adaptability to overcome the operational limitations of traditional flow control. This is particularly useful to small-scale uncrewed aerial vehicles since their mission requirements are rapidly expanding, but they are still limited in terms of ...
Ahmed K Othman, Nirmal J Nair, Andres Goza, Aimy Wissa   +3 more
openaire   +2 more sources

A quantitative analysis of flight feather replacement in the Moustached Tree Swift Hemiprocne mystacea, a tropical aerial forager. [PDF]

PLoS ONE, 2010
The functional life span of feathers is always much less than the potential life span of birds, so feathers must be renewed regularly. But feather renewal entails important energetic, time and performance costs that must be integrated into the annual ...
Sievert Rohwer, Luan-Keng Wang
doaj   +1 more source

Untangling causes of variation in mercury concentration between flight feathers [PDF]

Environmental Pollution, 2021
Bird feathers are one of the most widely used animal tissue in mercury biomonitoring, owing to the ease of collection and storage. They are also the principal excretory pathway of mercury in birds. However, limitations in our understanding of the physiology of mercury deposition in feathers has placed doubt on the interpretation of feather mercury ...
Marie Claire Gatt, Ricardo Furtado, José Pedro Granadeiro, Daniel Lopes, Eduarda Pereira, Paulo Catry   +5 more
openaire   +3 more sources