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← Nature & AnimalsWhich navigational error occurs when oilbirds use echolocation in caves?
A)Signal blurring from high humidity✓
B)Muted echoes caused by soft surfaces
C)Doppler shift confuses airspeed calculation
D)Interference from overlapping bird calls
💡 Explanation
Signal blurring occurs because high humidity causes attenuation of ultrasonic calls, disrupting echolocation. The degradation of the return signal leads to navigational errors, therefore oilbirds misjudge distances, rather than face other acoustic masking or signal interference.
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