. Birds in their relations to man; a manual of economic ornithology for the United States and Canada . NEARKK IlllMB. METHODS OF STUDYING THE FOOD OF BIRDS. 13 fruit-eating birds do not digest their food so thoroughly butthat its nature is apparent from the excreta. Wherever birdsroost in numbers, pellets or excreta or both may be gathered,and when analyzed will give results scarcely less valuablethan those obtained by dissection, with the advantage thatthere is no sacrifice of bird life. A study of the food of nestlings is less difficult and on thewhole more satisfactory. Both the kind and th
. Birds in their relations to man; a manual of economic ornithology for the United States and Canada . NEARKK IlllMB. METHODS OF STUDYING THE FOOD OF BIRDS. 13 fruit-eating birds do not digest their food so thoroughly butthat its nature is apparent from the excreta. Wherever birdsroost in numbers, pellets or excreta or both may be gathered,and when analyzed will give results scarcely less valuablethan those obtained by dissection, with the advantage thatthere is no sacrifice of bird life. A study of the food of nestlings is less difficult and on thewhole more satisfactory. Both the kind and the quantity. READY TO FEED. may be accurately determined without injuring so much asa feather. If the nest is on or near the ground, a small neutral-coloredtent may be set up beside it as near as you please, into whichyou may retire, and, by watching the progress of affairsthrough a small peep-hole, fill your note-book with an ac-count of the rations that are consumed. If on the ground thenest and young may be transferred to a sunken pail for betterobservation, as shown in the bobolink photographs usually happens, however, that the nest is not in a position 14 BIRDS IX THEIR RELATIOXS TO MAX. where a tent can be placed beside it. In that ease locate thetent in a good place as near by as may be, and then cut oflthe branch, fasten it strongly to a support by cords or screws,and by degrees move it to a place beside the tent. When it is not necessary to remove the nest, the tent maybe pitched as early as the day of hatching, in most cases atleast, without fear of causing the old birds to d
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