Migration in birds is guided in part by-

Celestiial navigation

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Temperature chnages

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Territorial aggression

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All of the above

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Solution

The correct option is A Celestiial navigation
Birds that nest in the Northern Hemisphere tend to migrate northward in the spring to take advantage of burgeoning insect populations, budding plants and an abundance of resting locations. This is guided by celestial navigation with a sextant.
So, the correct option is 'Celestial navigation'.

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