Many populations of long‐distance migrants are declining and there is increasing evidence
that declines may be caused by factors operating outside the breeding season. Among the …

Contemporary tracking studies reveal that low migratory connectivity between breeding and
non-breeding ranges is common in migrant landbirds. It is unclear, however, how internal …

Narrow migration corridors known in diurnal, social migrants such as raptors, storks and
geese are thought to be caused by topographical leading line effects in combination with …

Avian migrants often make substantial detours between their seasonal destinations. It is
likely some species do this to make the most of predictable wind regimes along their …

Background Performance of migrating birds can be affected by a number of intrinsic and
extrinsic factors like morphology, meteorological conditions and migration strategies. We …

To maximize fitness, flying animals should maximize flight speed while minimizing energetic
expenditure. Soaring speeds of large-bodied birds are determined by flight routes and …

Raptors primarily use soaring-gliding flight which exploits thermals and ridge lifts over land
to reduce energetic costs. However during migration, these birds often have to cross water …

Background Island breeding birds present an ideal system for studying migratory
movements in passerines because their populations are clearly demarcated, and individuals …

Recent improvements in satellite tracking, such as the miniaturization of transmitters, have
enabled the study of movements of an increasing number of bird species. The Lesser …

Migrant birds face a number of threats throughout their annual cycle, including persecution,
collision with energy infrastructure, and habitat and climate change. A key challenge for the …