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The Extent of Bird Migrations
Bird Watching by Radar
The Seasonal Timing and Energetics
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activity airplane altitude animals arctic tern banded barn swallows bats behavior biological clocks biologists bird flight bird migration bird navigation bird's blackpoll warbler blue-winged teal bobolinks breeding condition coast common terns crows cycle day length directional choices distance ducks earth's east experimental fall migration feeder feet flew flight paths flocks gannets gration gulls Haidinger's brushes homeward homing experiments homing pigeons initial headings insects island juncos Kramer latitudes loft magnetic field mallards Manx shearwaters Matthews migrating birds migration restlessness migration routes migratory birds migratory flight miles per day miles per hour nesting night normal northwest observed ocean orientation cage petrels plover radar radar echoes recoveries relatively release point reset rotation Rowan Sauers screen season shore birds shown in Fig southeast species speed spring star patterns starling summer sun-compass orientation tended tion warblers wild birds wings winter range