The isolation of these new rhabdoviruses from birds demonstrates the value of direct culture for detecting new and unexpected viral agents.
However, rural birds demonstrated relatively low pre- and post-trial plasma CORT levels during the human-exposure trials in 2015.
Our objective was to test the hypothesis that forest birds demonstrated thresholds in these four basic dynamics to varying amounts of forest cover and fragmentation.
The calls of males and females show differences in structure and an acoustic analysis on 59 captive birds demonstrated 100% accuracy in sexing when compared with molecular methods.
Extant birds demonstrate multiple approaches to feeding on and in water, including surface feeding, plunge diving, and surface diving [101].
Flapping frequency, the crux of the Sato et al. argument for giant pterosaur flightlessness, does not simply differ with mass or wingspan: modern birds demonstrate that span, body mass, and wing area, and relative muscle fractions can influence flapping rates considerably [58].
Virulent NDV strains are still isolated frequently from vaccinated birds, demonstrating that NDV remains a sustained threat to commercial flocks.
Thus, these findings in wild birds demonstrate the potential for wild birds to disseminate HPAI viruses (H5N1) to areas otherwise free from the viruses.
Field playback experiments and laboratory studies in birds demonstrated that male song causes females to approach the sound source (Baker et al. 1981; Eriksson & Walin 1986).
To overcome periods of energetic constraint generated by diminished food supply and/or low ambient temperature, many small mammals and birds demonstrate controlled reductions in core body temperature (Tb) and metabolic rate, a phenomenon known as torpor.
