In an experiment on wayfinding, indigo buntings were housed in outdoor cages with blotting paper

walls and inkpads on the floors. Which of the following facts demonstrated to researchers that the
indigo bunting uses the positions of stars to orient its migration?



a. The birds' inky feet made prints indicating the direction in which they attempted to fly.
b. In spring the inky footprints were mostly on the northern side of the cage.
c. In fall the inky footprints were mostly on the south side of the cage.
d. On cloudy nights the footprint patterns were random.
e. In spring and fall, the anterior pituitary of the bird's brain generated a series of hormonal
changes.


D

Biology & Microbiology

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