Apprendre l'anglais > Cours & exercices d'anglais > Exercices d'anglais > test d'anglais n°119494 : Migration des oiseaux

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Migration des oiseaux

Birds' migration fascinates experts and amateurs alike. For example the cuckoo from Kamchatka in Eastern Russia flies some 35,000 kilometres from there to South Africa, and every year travels non-stop for three days and nights across the Mediterranean Sea or through the Sahara Desert.The main puzzle for us humans is still to know how the birds are able to navigate so precisely; after flying thousands of kilometers from their home, some land right on the same tree as they did the previous winter. In birds stations, they are attempting to get to the bottom of the navigation mystery. Migratory birds follow an inner compass and an inner map. They take their bearings from two separate processes : birds navigate by the sun, stars and the earth's magnetic fields.They likely also gauge space by the magnetic fields and their sense of smell. How birds sensory perception of magnetic fields works is still an open question. Maybe the answer will be found some day.

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1. Bird fascinates humans.

2. The cuckoo from Kamchatka lives in Russia.

3. It flies some kilometres.

4. How the birds are able to navigate so is a puzzle.

5. Some land right on the same as they did the previous winter.

6. In birds stations, they are to get to the bottom of the navigation mystery.

7. Migratory birds follow an inner .

8. They take their bearings from separate processes.

9. They likely also gauge space by the magnetic field and their sense of .

10. How birds sensory perception of magnetic fields works is still an question.

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