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Zebra finches do not use their frontal visual field for inspection of a grain before pecking. Instead, they use the fovea either of the left or the right eye. The fovea is "looking" laterally with an angle of about 60 degrees from the direction of the beak. The graph shows the angle under which grains are inspected before pecking.

During flight, the head is tilt against the horizon by 21 degrees. In this position, the lateral semicircular canal of the inner ear and the topographical map of the optic tectum †are both in register with the horizon. The angle of 21 degrees cannot retained when landing at a perch.
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