 To show the astonishing capacity of birds' stomachs and to reveal the extent to which man is indebted to birds for the destruction of noxious insects, the following facts are given as learned by stomach examinations made by assistants of the Biological...  In Berkshire Fields - Page 5by Walter Prichard Eaton - 1920 - 312 pagesFull view - About this book
 | Beneficial birds - 1913 - 40 pages
...be avoided, even for the sake of obtaining data upon which to base legislation for their protection. It is interesting to observe that, hungry birds —...examinations made by assistants of the Biological Survey: A tree swallow's stomach was found to contain 40 entire chinch bugs and fragments of many others, besides... | |
 | Alabama. Department of Conservation - Fishes - 1914 - 608 pages
...be avoided, even for the sake of obtaining data ujwn which to base legislation for their protection. It Is Interesting to observe that hungry birds —...examinations made by assistants of the Biological Survey : A tree swallow's stomach was found to contain 40 entire chinch bugs and fragments of many others, besides... | |
 | National Geographic Society (U.S.). - 1921 - 226 pages
...to birds the reference in both instances is to the breeding range. COMMON BIRDS OF TOWN AND COUNTRY time — are not content to fill their stomachs with...examinations made by assistants of the Biological Survey: A tree swallow's stomach was found to contain 40 entire chinch-bugs and fragments of many others, besides... | |
 | United States. Department of Agriculture - Agriculture - 1913 - 918 pages
...crop or gullet also is crammed. It is of ten the case that when the stomach isopened and thecontents piled up the pile is two or three times as large as...examinations made by assistants of the Biological Survey: A tree swallow's stomach was found to contain 40 entire chinch bugs and fragments of many others, besides... | |
| |
