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Nature & Animals

Which risk arises when migratory birds encounter rapid deflections in Earth's magnetic field?

A)Increased susceptibility to brood parasitism
B)Disrupted endogenous circannual rhythms
C)Erroneous perception of migration direction
D)Heightened energetic expenditure for flight

💡 Explanation

Navigation relies on a magnetic compass; a deflected field disrupts the internal compass, therefore producing navigation errors, rather than affecting rhythms or brood parasitism. Magnetoreception, using cryptochrome proteins is the mechanism affected.

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