Results 91 to 100 of about 24,098 (229)

Investigation of the Influence of Different Flapping Wing Motion Characteristics on Aerodynamic Parameters under Incoming Flow [PDF]

Journal of Applied Fluid Mechanics
There is high flight efficiency of flapping wing aircraft, and its hovering ability, wind loading rating, maneuverability and concealment are better than that of multi-rotor and fixed-wing aircraft. In this paper, the bionic flapping wing is taken as the
Z. Guo, R. Liu, S. Zheng, J. Xu, J. Chang   +4 more
doaj   +1 more source

Intermittent Gliding in the Hunting Flight of the Kestrel, Falco tinnunculus L. [PDF]

, 1983
The hunting flight of the kestrel (Falco tinnunculus) consists of short bouts of flight at wind speed against the wind with the eyes in a fixed position relative to the ground, and of short flights from one such position to the next.
Daan, S.,, Videler, J.J.,, Weihs, D.,
core   +1 more source

Short‐term effects of wildlife rehabilitation disappear over time in the wild: A case study on Spanish imperial eagles

Conservation Science and Practice, EarlyView.
We assessed the effectiveness of Wildlife Recovery Centers by comparing dispersal behavior of rehabilitated and wild Spanish imperial eagles using GPS tracking. Rehabilitated individuals initially moved shorter distances, rested more, and hunted less than wild controls, but these differences declined over time and ultimately disappeared.
Unai Ormazabal‐Santa Cruz, José M. Abad‐Gómez, Manuel Parejo, José M. Guzmán‐Bolaños, María Arredondo, María Jesús Palacios, Ángel Sánchez, Álvaro Guerrero, Cosme López‐Calderón   +8 more
wiley   +1 more source

The flapping flight of birds: Analysis and application

, 2014
De aerodynamica van slagvlucht bij vogels is eigenlijk helemaal niet zo duidelijk en bekend als vaak wordt gedacht, zoals tijdens recente studies aan het licht kwam. De aerodynamische mechanismen tijdens actieve slagvlucht verschillen namelijk behoorlijk van de aerodynamica van bijv. vliegtuigen.
openaire   +2 more sources

Can you really change your stripes? Stable wing ornamentation suggests limited condition‐dependent signalling in female common eiders

Ibis, EarlyView.
Variation in the expression of white ornaments, such as flank spots or wing stripes, has previously been related to indices of individual quality in birds. We measured the white wing stripes of colour‐banded female common eiders Somateria mollissima in three islands in Iceland from 2014 to 2023, to determine whether the expression of these ornaments is
Jón Einar Jónsson, Elisabeth Knudsen, James A. Fletcher, Ellen Magnúsdóttir, Árni Ásgeirsson, Jamie N. Carroll   +5 more
wiley   +1 more source

Wind-Aware Energy-Efficient Trajectory Planning for Flapping-Wing Robots

IEEE Access
Flapping-wing robots have recently attracted significant interest due to their agility and potential energy efficiency compared to traditional aerial systems such as multirotor vehicles.
Manuel Fernandez-Melgosa, Raul Tapia, Anibal Ollero   +2 more
doaj   +1 more source

Morphological evolution of bird wings follows a mechanical sensitivity gradient determined by the aerodynamics of flapping flight. [PDF]

Nat Commun, 2023
Rader JA, Hedrick TL.
europepmc   +1 more source

Allometric patterns in Rhamphorhynchus muensteri and their role in the paleoecology, life habits, and taxonomic framework of pterosaurs

Journal of Anatomy, EarlyView.
The Graphical Abstract ilustrates the different allometric pattern within different Pterosauria groups, highlighting how the allometry influences the flight and habits of Pterosauria. Abstract Pterosaurs were the first vertebrates to achieve powered flight, a result of various unique anatomical adaptations, and significant morphological diversity ...
Gabriela Menezes Cerqueira, João Lucas Da Silva, Ingmar Werneburg, Mario Bronzati, Alex Sandro Schiller Aires, Felipe L. Pinheiro, Rodrigo Temp Müller   +6 more
wiley   +1 more source

Design of a High-Performance Biomimetic Butterfly Flyer

Machines
To achieve miniaturization and lightweight design of a flapping-wing aircraft, a high-performance biomimetic butterfly flyer was designed based on an analysis of the butterfly’s body structure and flight principles.
Zhihan Li, Gaolei Qiu, Daqian Zhang, Hongshuang Li   +3 more
doaj   +1 more source

On the role of tail in stability and energetic cost of bird flapping flight. [PDF]

Sci Rep, 2022
Ducci G, Vitucci G, Chatelain P, Ronsse R.   +3 more
europepmc   +1 more source