填空题

The first hypothesis concerning birds’ "mapping,’ ability involves an"______".

【参考答案】

odor map
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German ornithologists proved that birds have a______guiding their navigatory behavior though some biologists argued that it was impossible for birds to sense the weak magnetic force of the Earth.
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The second hypothesis concerning the mapping ability of birds proposes an idea that birds may be able to extract latitude and longitude from______.
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