THE BEHAVIOR OF THE CROW 195 



TABLE 2 — Continued 



Correct choices 



improved surprisingly little with practice. The percentage of 

 correct choices with the 5 centimeter versus the 3 centimeter 

 circle was as low during the last few days of the training as it 

 was on August 10th and 11th when they were first required to 

 distinguish between these circles. 



Throughout these experiments, the behavior of the crows 

 while working was very erratic. Some days they worked slowly 

 and carefully. Sudden noises, such as those caused by the 

 opening or closing of an entrance or exit door, did not greatly 



