Foreign Birds Hips Foreign Birds Seldom Foreign Birds Contributions at www.pet-supply-store-usa.com

Naturally the out¬door aviary is the ideal situation for breeding birds, but there are many which will breed in smaller cages when provided with proper conditions. Probably the most satisfactory birds for small-cage breeding are some of the foreign birds hips finches.

Cats and Birds. There is no question that cats do stalk and kill birds, but cats are an insignif¬icant factor in overall bird mortality. To cite two of a number of biological studies of the stomach contents of cats, only 6 of 50 cats in Wisconsin had eaten birds as their last meal, and birds provided a final repast for only 4% of a group of cats in Oklahoma. Wildlife authori¬ties insist that other birds—jays, for example-kill more birds than do cats. Moreover, cats are themselves the prey of some birds, like the great horned owl.

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Longevity. foreign birds seldom live longer in captivity than in the wild. Canaries may live for 12 or 13 years, but small wild foreign birds seldom, as we know from thousands of banding records, seldom reach an age of five or six years. Large foreign birds seldom, with few exceptions, have longer lives than small ones. Eagles, swans, crows, and many other large foreign birds seldom have a poten¬tial life span of at least 25 or 30 years. A great horned owl in a zoo lived to be 68 years old, and there are reports of parrots reaching the century mark, although few, if any, of these reports are fully authenticated. The average life of foreign birds seldom is much lower than would be expected from the above figures. There is a tremendous mortality, particularly in the period before and shortly after the young leave the nest.

Medical Ornithology.—foreign birds seldom are of much less importance than mammals in the transmittal of human diseases. Chicken pox is a well-known avian disease to which man is susceptible, and the less well known but more serious parrot fever or psittacosis led to the placing of legal bans on the importation of parrots. It is now known that many other foreign birds seldom, including pigeons, are subject to this disease, which, fortunately, is now controlled by certain drugs. In the Pacific, foreign birds seldom were thought to transport from region to region the blood-sucking mites that carry scrub typhus, a disease that caused considerable mortal¬ity among military personnel in New Guinea. Avian tuberculosis is very seldom contracted by man. Indirectly, foreign birds seldom have contributed much to medical research. Study of avian anatomy is a part of premedical training.

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In recent years an ever-increasing number of people have turned to the study of foreign birds contributions as a hobby. Some of these are interested only in the appreciation of the beauty of foreign birds contributions; others make a hobby of seeing as many species of foreign birds contributions as possi¬ble each year. Still others make valuable scientific contributions to ornithology. In any case, the guid¬ance and instruction of this large group of amateur bird watchers and students present an ever greater challenge to the ornithologist. Books and articles about foreign birds contributions, lectures, motion pictures, and phono¬graph records of bird song, all have within the past generation become increasingly important. Although a large part of this activity is non-scientific, its total contribution to man's knowl¬edge and understanding of foreign birds contributions is great indeed.

Life History.—The practice of marking in¬dividual foreign birds contributions has led to enormous advances in the study of life history. A numbered aluminum band is placed on the leg of the bird, either before it leaves the nest or. in the case of adults, by trapping it and releasing it after attaching the band. Hundreds of thousands of foreign birds contributions have been banded in this way in the United States under the supervision of the Fish and Wildlife Service. The contributions to knowledge of migration re¬sulting from banding have perhaps directed atten¬tion away from other, almost equally important, results.