Results 51 to 60 of about 205,543 (241)

The value of a mouthful: Flight initiation distance as an opportunity cost [PDF]

open access: yes, 2015
Flight initiation distance of animals when approached by a potential predator reflects the risk that an individual is willing to take when the individual has to gauge the value of staying put relative to the cost of flight.
Møller, Anders Pape
core   +3 more sources

The Impact of Dealiasing Biases on Bird and Insect Data Products of C-Band Weather Radars and Consequences for Aeroecological Applications

open access: yesRemote Sensing
(1) The aliasing of radial velocities from weather radars is a known challenge in meteorology. It may also occur during bird migration if the unambiguous velocity threshold is below the birds’ ground speed.
Nadja Weisshaupt   +2 more
doaj   +1 more source

Bird Collisions with an Unmarked Extra-High Voltage Transmission Line in an Average Riverine Landscape: An Appeal to Take a Closer Look

open access: yesBirds
Anthropogenic structures such as overhead powerlines pose potentially high collision risks to flying animals, particularly birds, leading to millions of fatalities each year.
Arno Reinhardt   +4 more
doaj   +1 more source

Evaluating UAM–Wildlife Collision Prevention Efficacy with Fast-Time Simulations

open access: yesAerospace
Urban Air Mobility (UAM) promises to reduce ground traffic and journey times by using electric vertical take-off and landing (eVTOL) aircraft for short, low-altitude flights, especially in urban environments.
Lewis Mossaberi   +2 more
doaj   +1 more source

Neotropical Bird Migration During The Ice Ages: Orientation And Ecology [PDF]

open access: yes, 1996
Reconstruction of breeding habitat of North American Neotropical migrants 18,000 years ago and 9,000 years ago indicated major shifts in both location and composition of plant communities relative to present conditions.
Webb, T., III   +1 more
core   +2 more sources

Reciprocal relationships in collective flights of homing pigeons [PDF]

open access: yes, 2011
Collective motion of bird flocks can be explained via the hypothesis of many wrongs, and/or, a structured leadership mechanism. In pigeons, previous studies have shown that there is a well-defined hierarchical structure and certain specific individuals ...
D. J. T. Sumpter   +6 more
core   +2 more sources

Do birds respond to spiral markers on overhead wires of a high-voltage power line? Insights from a dedicated avian radar

open access: yesGlobal Ecology and Conservation, 2020
Growing human population demands the expansion of the energy transmission grid. Power lines represent a major death hazard for many species, especially birds.
Diego Pavón-Jordán   +6 more
doaj   +1 more source

Foraging strategies of breeding seabirds studied by bird-borne data loggers [PDF]

open access: yes, 2004
Our research group has devised and manufactured a data logger, which, glued on the back of a bird, can detect and memorise the direction in which the bird is heading during a flight.
Benvenuti,Silvano, Dall\u27Antonia,Luigi
core   +1 more source

Patterns of nocturnal bird migration in southern Mexico

open access: yesRevista Mexicana de Biodiversidad, 2017
The Isthmus of Tehuantepec is the narrowest landmass between the Gulf of Mexico and the Pacific Ocean. It is known as an important stopover site and migration corridor for Nearctic-Neotropical migratory birds.We characterized nocturnal bird migration ...
Sergio A. Cabrera-Cruz   +2 more
doaj  

Deep learning workflow to support in-flight processing of digital aerial imagery for wildlife population surveys.

open access: yesPLoS ONE
Deep learning shows promise for automating detection and classification of wildlife from digital aerial imagery to support cost-efficient remote sensing solutions for wildlife population monitoring.
Tsung-Wei Ke   +9 more
doaj   +1 more source

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