210 ROLAND F. HUSSEY 



Even so faint a sound as that made by my pencil in writing 

 on the note-book page seemed to cause the bird some uneasiness. 

 Singing caused very slight apprehension, not nearly so much as 

 did the sound of the waves thrown up on the shore by a passing 

 launch. At the second release of the camera shutter the bird 

 showed less concern than was evident the first time; but when 

 I moved the camera in winding the film, it was alarmed to the 

 point of standing in the nest, and it even walked off while I 

 was rewinding the shutter curtain. It was gone only five 

 seconds. 



In the afternoon a companion accompanied me when I returned 

 to the blind. The bird stayed on the nest when we entered 

 the tent; but when I moved my finger in the aperture it showed 

 great alarm, and left the nest when I flashed a mirror there: 

 it was gone seventeen minutes. On its return I waited for 

 several minutes before attempting any experiments. I noted 

 that the bird was always on the alert, particularly for sounds 

 from the tent; however, it was not insensible to other sounds, 

 for several times it took food, usually large ants, from the edge 

 of the nest, apparently in response both to auditory and to 

 visual stimuli; the thrush seemed to be made aware of the ant 

 through an auditory stimulus, and then to discover it through 

 the visual sense. The bird seemed also to start visibly at 

 sudden noises from outside the tent; but on this date it was 

 concerned chiefly with those which were made within the blind. 



The day was clear and warm, and the bird panted con- 

 siderably. I found that usually it would close its bill when I 

 made a sudden sound, and would turn its head and wink its 

 eye, while to sounds from outside the tent the response con- 

 sisted usually in merely turning the head. " The bird sometimes 

 turned its head at our conversation, but usually it paid no 

 attention to it; once it seemed quite disturbed at the noise 

 made by tearing birch-bark. My companion left after half an 

 hour in the tent. 



The slightest movement of the tent-wall near any of the 

 apertures was sufficient to attract the bird's attention, but it 

 seemed only slightly concerned by the movements of the canvas 

 elsewhere. A sudden gust of wind sounding in the pines over- 

 head caused the bird to start slightly, and soon afterward it 

 started noticeably at a junco's song from the same trees. Then, 



