The robo-hummingbird Shinshu is able to leverage the same unsteady aerodynamic mechanisms that insects and birds used to produce high lift. Under the high-altitude condition (9000 m), the reduction in the air density, while keeping the flapping frequency the same, resulted in an increased ...
locomotion [96], and circadian rhythm [97] in mammals, and; fibroblast growth factor receptor homolog 1 (FGFR1, Lda.18769), which shows morphological effects in birds [98] and locomotory effects in mice [99,100]. Expanding our assessment to a selection of other ...
Migrant birds perform migra- tory nocturnal flights, presumably to overcome energetic constraints by flying in cooler and more laminar air1, to reduce their predation risk during migration2 and to use celestial cues for orientation3. In order to migrate over long distances, migratory birds undergo ...
et al. (2015) Interspecific variation in the structural properties of flight feathers in birds indicates adaptation to flight requirements and habitat. Functional Ecology, 29, 746-757.Pap PL, Osvath G, Sandor K, Vincze O, Bărbos L, Marton A, Nudds RL, Vagasi CI. Interspecific variation ...
{r}}\), wherepis a vector with the four parameters andra vector with the commanded rotor speeds. Although these EKF parameters can be estimated in a supervised manner from data, we obtained the best results by using an evolutionary optimization algorithm, covariance matrix adaptation evolutionary ...
This step was to remove periods when birds may be using offshore platforms to sit or roost [7], and may therefore be misidentified as sitting on the sea-surface. Altimeter calibration Barometric pressure sensors recorded a mean value of pressure in millibars (mbar) and temperature in kelvin ...
Many animals have evolved a migratory lifestyle as an adaptation to seasonality,1,2 ranging from insects3 to fish,4 terrestrial and marine mammals,5, 6, 7 and birds.8 Old World swifts have evolved an extraordinary aerial non-breeding life phase lasting for 6–10 months.9, 10, 11 Swifts...
northropi is suggested by its allegedly short wings and, apparently mirroring the condition in modern flightless birds, by being considerably larger than its volant counterparts [25]. All three of the studies discussed above share common comparisons between pterosaurs and b...
Therefore, in the absence of proto-pterosaur fossils, it is difficult to study how flight first evolved in this group. Here we describe the evolutionary dynamics of the adaptation of pterosaurs to a new method of locomotion. The earliest known pterosaurs took flight and subsequently appear to ...
In captivity this is observed as a gradual transition of daytime activity developing into nocturnal activity, but how wild birds prepare their daily rhythms for migration remains largely unknown. Using an automated radio-telemetry system, we compared activity patterns of free-living migrant and ...