The Idea for a Time-Compensated Sun Compass Began When Gustav

Multiple Choice

The idea for a time-compensated sun compass began when Gustav Kramer found that, when the sun was replaced with a stationary light source, the birds

A) completely lost their ability to orient appropriately.
B) continually adjusted their orientation as though the artificial sun were moving.
C) maintained a constant orientation with respect to the stationary source.
D) oriented correctly during the spring but became disoriented in the fall.