Executive summary This report consists of a critical review and synthesis of recent
information on the status of the Northern Spotted Owl. The report has been prepared to …

The aerodynamic designs of winged drones are optimized for specific flight regimes. Large
lifting surfaces provide maneuverability and agility but result in larger power consumption …

Animals' avoidance of humans or human activities can have several adverse effects on their
distribution and abundance, and a frequent tool used by conservation managers to avoid …

The annual migrations of birds are impressive phenomena that raise interesting
physiological, evolutionary, and ecological questions. One facet of migration that has long …

In order to increase the efficiency of monitoring and conservation efforts, it is of key
importance to develop sound quantitative methods that are able to indicate which key areas …

Three main benefits are thought to underlie communal roosting in birds: a reduction in
thermoregulation demands, a decrease in predation risk, and an increase in foraging …

Trained observers counted migrating raptors and vultures from ridgetops at six sites in the
Intermountain and Rocky Mountain Flyways of western North America: Goshute Mountains …

Video filmed by a camera mounted on the head of a Northern Goshawk (Accipiter gentilis)
was used to study how the raptor used visual guidance to pursue prey and land on perches …

A major assumption of our work was that validation research will be conducted by agency
scientists and other researchers to corroborate our findings. As a preliminary step in the …

Annual bird mortality in the United States from anthropogenic sources is estimated at one
billion. Urban raptors are affected by many of these factors; however, little is known about …