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📘 Migration begins with a choice

Picture a young bird leaving a familiar place. It must choose a direction before it knows the whole route. You will see how inherited tendencies, compasses, landmarks, and experience turn that first heading into a journey.

5
lessons
~25 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. A route starts with directionDistinguish orientation, navigation, inherited direction, and tracking evidence.Migration begins with a directional problem shaped by inherited tendencies, wind, and route information.
  2. The magnetic field is a referenceExplain how magnetic field information can support avian orientation.Birds can use magnetic references, including inclination cues, while the exact sensory mechanisms remain under study.
  3. Sky and landscape provide cuesDescribe how sun, stars, landmarks, and stopovers guide migration.Celestial references and familiar landscapes provide complementary directional and route information.
  4. Experience builds a routeConnect memory and inherited routes to flexible navigation.Older birds can combine inherited tendencies with learned routes, goals, landmarks, and stopover knowledge.
  5. Navigation is a flexible toolkitSynthesize magnetic, celestial, visual, memory, and inherited navigation cues.Bird migration emerges from repeated decisions that integrate several imperfect signals with changing conditions.

Questions this course answers

What is the difference between orientation and navigation?

A compass heading is not the same as knowing where the bird is and where its goal lies.

What can influence a young bird's first migration?

Juveniles can begin with genetically influenced direction before they have route experience.

What does an inclination compass detect?

Inclination is the angle at which magnetic field lines meet the Earth's surface.

Why is the magnetic compass described as one tool among several?

Migration occurs in changing landscapes and weather, so birds integrate multiple cues.

How can a time-compensated sun compass work?

The sun's meaning for direction changes as it moves, so time is part of the reference.

What does a landmark usually provide?

Landmarks help pilot familiar stretches but do not replace broad compasses everywhere.

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