Results 41 to 50 of about 357,418 (307)
Feather moult and bird appearance are correlated with global warming over the last 200 years
Nature Communications, 2019 Most passerine bird species replace part of their plumage within the first year of life. Here, using data from 4,012 individuals of 19 species, Kiat et al.
Y. Kiat, Y. Vortman, N. Sapir
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Bottlenose Dolphins and Antillean Manatees Respond to Small Multi-Rotor Unmanned Aerial Systems
Frontiers in Marine Science, 2018 Unmanned aerial systems (UASs) are powerful tools for research and monitoring of wildlife. However, the effects of these systems on most marine mammals are largely unknown, preventing the establishment of guidelines that will minimize animal disturbance.
Eric A. Ramos +6 more
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Limitations on Animal Flight Performance [PDF]
Journal of Experimental Biology, 1991 ABSTRACT Flight performance seems to change systematically with body size: small animals can hover and fly over a wide range of speeds, but large birds taxi for takeoff and then fly over a narrow speed range. The traditional explanation for this is that the mass-specific power required for flight varies with speed according to a U-shaped
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Avian Research, 2017 Background The Western Marsh Harrier (Circus aeruginosus) is a partial migrant with the populations from Eastern and Northern Europe migrating south to sub-Saharan Africa.
Nicolantonio Agostini +4 more
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Constructing a Stochastic Model of Bumblebee Flights from Experimental Data [PDF]
, 2013 PMCID: PMC3592844This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are ...
A James +39 more
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Animal Locomotion: Near-Ground Low-Cost Flights [PDF]
Current Biology, 2018 Flying animals expend considerable energy. A new study reveals that bats reduce their flight power requirements by nearly a third when flying in 'ground effect' close to the surface.
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Disordered but rhythmic—the role of intrinsic protein disorder in eukaryotic circadian timing
FEBS Letters, EarlyView.Unstructured domains known as intrinsically disordered regions (IDRs) are present in nearly every part of the eukaryotic core circadian oscillator. IDRs enable many diverse inter‐ and intramolecular interactions that support clock function. IDR conformations are highly tunable by post‐translational modifications and environmental conditions, which ...
Emery T. Usher, Jacqueline F. Pelham
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Of hummingbirds and helicopters: Hovering costs, competitive ability, and foraging strategies [PDF]
, 2004 Wing morphology and flight kinematics profoundly influence foraging costs and the overall behavioral ecology of hummingbirds. By analogy with helicopters, previous energetic studies have applied the momentum theory of aircraft propellers to estimate ...
Altshuler, Douglas L. +2 more
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Mechanisms and Implications of Animal Flight Maneuverability [PDF]
Integrative and Comparative Biology, 2002 Accelerations and directional changes of flying animals derive from interactions between aerodynamic force production and the inertial resistance of the body to translation and rotation. Anatomical and allometric features of body design thus mediate the rapidity of aerial maneuvers.
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Time after time – circadian clocks through the lens of oscillator theory
FEBS Letters, EarlyView.Oscillator theory bridges physics and circadian biology. Damped oscillators require external drivers, while limit cycles emerge from delayed feedback and nonlinearities. Coupling enables tissue‐level coherence, and entrainment aligns internal clocks with environmental cues.
Marta del Olmo +2 more
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