...Itis probably a digestive difficulty of some sort... 
Harry M. Lamon 「Ducks and Geese」
...Of 246 cottonmouths that I examined for food items, only 46 contained prey in their digestive tracts...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...In the axis of the sac, thus divided, hangs a smaller one, formingthe digestive cavity, and supported for its whole length by the six primarypartitions...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...The Bolina (), like the Pleurobrachia, is slightly oval in form, witha longitudinal split at one end of the body, forming a mouth which opensinto a capacious sac or digestive cavity...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...Itis a simple ovate sphere, the interior of which is almost entirely occupiedby an immense digestive cavity...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...This removal of the digestive cavity to theextremity of the proboscis gives to the tubesarising from it a very different and much sharper curve than they havein the Zygodactyla...
Elizabeth Cabot Cary Agassiz 「Seaside Studies in Natural History」
...To a horse that is becoming too fat, or hassurfeit, grease, or mange, or that is out of condition from inactivityof the digestive organs, a dose of physic is often mostserviceable...
Richard L. Allen 「Domestic Animals」
...They cannot stimulate the stomachand increase its digestive power, for they are not on the digestiveportion of the stomach...
Richard L. Allen 「Domestic Animals」
...Its taste to the white man largely depends on one's hunger or digestive cravings...
Oliver Hartley 「Hunting Dogs」
...The digestive track is the principal seat of the disease, butof course its presence is most easily recognised at those parts which aremost exposed to view...
Dinks, Mayhew, and Hutchinson 「The Dog」
...The generative organs, in the male of the canine species, are peculiarlysympathetic with the digestive functions...
Dinks, Mayhew, and Hutchinson 「The Dog」
...There is danger, especially when the bird is first put tofeed, that more may be eaten at once than the digestive organs canmanage...
Robert Jennings 「Sheep, Swine, and Poultry」
...Damaged feeds retard or prevent digestion, and sometimes they contain orcause to be generated substances that irritate the digestive tract, or aredistinctly poisonous to the animal...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...—This term also seems tobe vaguely applied to various disturbances of the digestive function, or tosome disease which is in reality in the stomach or bowels...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...If the poisonexerts a remote influence alone, the action is quite different, little or nolocal effect being produced upon the digestive organs...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
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