Most birds cannot cover the distance between their breeding and
winter quarters in one hop. They have to make multiple flights
alternated with stopovers. Which factors govern the birds'
decisions to stop, to stop for how long, when to resume flight?
What is better - to accumulate much fuel and to make long flights
for many hundreds of kilometres, or to travel in small steps? Is it
necessary to find habitats similar to the breeding ones or other
habitats would do? Are long migratory flights indeed so costly
energetically as usually assumed? This monograph summarizes our
current knowledge on the ecology of songbird migrants during
migratory stopovers and on their behaviour. "
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