Researchers at Cornell University have demonstrated that homing pigeons can sense changes in the earth's magnetic field, see light waves that people cannot see, detect low-frequency sounds from miles away, sense changes in air pressure, and can identify familiar odors.

A sense changes in air pressure, and can identify familiar odors
B can sense changes in air pressure, and can identify familiar odors
C sense changes in air pressure, and identify familiar odors
D air pressure changes can be sensed, and familiar odors identified
E air pressure changes are sensed, and familiar odors identified

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