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It has been estimated that around 50 different animal species make use of the Earth’s magnetic field in A ________________ . What is surprising to us humans is how a relatively weak force like the Earth’s magnetic field could have such an influence on animal behaviour.
Scientists have known for a long time that migratory birds are sensitive B _________________ and use it to help them find their way during migration, picking up the north-south direction like a compass needle. A recent Swedish study showed that, C ____________________, a sensitivity to the Earth’s magnetic field enabled birds to select the best places to stop along their migratory route to get food and gain weight in readiness for the continuation of their long f light. The Swedish scientists from Lund University used artificial magnetic fields D ______________________ from Sweden to Southern Africa. They knew that the birds stopped for food in northern Egypt. This enables the birds to build up fat in preparation for the long journey over the Sahara Desert. The scientists’ research using simulations of changes in the Earth’s magnetic field along the birds’ route showed E ____________________ .
Experiments with other migratory animals have also shown how important the Earth’s magnetic field is F _______________________.
1. order to help them navigate
2. as their changes in direction
3. apart from general direction
4. to the Earth’s magnetic field
5. that the birds perceived such changes
6. along the migratory route of nightingales (соловьев)
7. in helping creatures find their way
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