A little after six o'clock one July morning on the campus of the University of Tennessee, I stood near the centre of a semi-circle of twenty-five school teachers whose expressions indicated a high state of excitement, and whose fifty eyes were riveted on a scene of slaughter but a few feet from them. For five minutes we had scarcely moved. During this time the lives of thirty-two specimens of animal life had been blotted out. The perpetrator of this holocaust was a creature known to scientists as _Spizella socialis_--called by ordinary people Chipping Sparrow. Its victims were small insects which but a moment before were disporting themselves on the grass. _Preparation of Teachers._--One teacher expressed {240} surprise that a bird could find so many of these choice morsels in so short a time. She had never imagined that so many insects inhabited so small an area as that to which the bird had confined its operations. "Very well," said the instructor, "suppose all of you get down and see how many insects you can find in five minutes." So while he held the watch all proceeded to take part in a bug-hunting contest. In this novel undertaking even the women of the class displayed great zeal. When time was called it was found that one student had a credit of fourteen, another sixteen, a third nineteen, and one tall young woman with glasses exhibited twenty-one insects in the folds of her handkerchief. A stranger watching the actions of this band of eager, early-rising teachers might have been puzzled to determine what induced them to assemble at this hour of the day for the evident purpose of watching the habits and activities of small birds that the ordinary person passes without notice. They were, nevertheless, occupied in one of the most valuable {241} studies that could have claimed their attention. [Illustration: Preparing for the coming of the birds. A Junior Audubon class on Prince Edward Island] For many years the United States Department of Agriculture has been employing trained naturalists to give their time to the investigation of the damage done to growing crops by the insect hosts that infest fields and forests. These and other experts have come forward with astounding statements regarding the destructiveness of birds to insects. We are told, too, that each bird is virtually a living dynamo of energy; that its heart beats twice as fast as the human heart; and that the normal temperature of its blood registers over a hundred degrees. It is a simple fact of biology, therefore, that a tremendous amount of nourishing food is necessary for the bird's existence. Vast quantities of insects are needed for this purpose.