But how differently their kin of the family Falconidæ act in their relations to man! 'Wild as a Hawk' has become an adage. These birds are universally condemned. To kill one is a commendable act. Every ones hand is raised against them. In some localities a price has actually been set upon their heads.
A fondness for chickens, it is alleged, is the chief crime of Hawks, and in popular parlance all Hawks are 'Chicken Hawks' and as such are to be killed on sight.
Naturalists have long been aware that only one of our common Hawks habitually preys upon poultry while most of our species, by feeding largely on meadow mice, are actually beneficial. It was not, however, until this matter received the attention of the Biological Survey of the United States Department of Agriculture, that the economic status of Hawks, as well as of Owls, was placed on a sound scientific basis. In Dr. A. K. Fisher's report on the food of Hawks and Owls, issued by the Biologic Survey in 1893, the results of the examination of the contents of several thousands stomachs of these birds is tabulated. It is stated, for example, that only three out of two hundred and twenty stomachs of the so-called 'Chicken' or Red-shouldered Hawk contained the remains of poultry, while mice were found in no less than one hundred and two, and insects in ninety-two.
That the Sparrow Hawk is also wrongly named is clear from a study of its food, only fifty-four out of three hundred and twenty stomachs examined containing remains of birds, while insects were found in two hundred and fifteen.
As a matter of fact, among our commoner Hawks, the Cooper and Sharp-shinned are the only ones feeding largely on birds and poultry, and if the farmer will take the pains to ascertain what kind of Hawk it is that pays unwelcome visits to his barn-yard, he will be spared the injustice of condemning all Hawks for the sins of one or two.
Feeding after sunset, when the small mammals are most active, Owls are even more beneficial than Hawks. The Great Horned Owl, it is true, has an undue fondness for poultry, but the bird is generally so rare near thickly populated regions that on the whole it does comparatively little harm.
Fortunately, it is those Owls which are most common in settled regions which are of most value to man. Thus, our little Screech Owl feeds chiefly on mice and insects. Only one of the two hundred and fifty-five stomachs examined by Dr. Fisher contained the remains of poultry while mice were found in ninety-one and insects in one hundred. Of the Short-eared or Marsh Owl, seventy-seven out of one hundred and one stomachs contained mice remains, and the same injurious little rodents were found in eighty-four out of one hundred and seven stomachs of the Long-eared Owl.
The bones and hair of the small mammals eaten by Owls are rolled into oblong pellets in the stomach and are ejected at the mouth. These pellets may often be found in large numbers beneath the roosts in which Owls pass the day. In 200 such castings of the Barn Owl Dr. Fisher found the remains of 454 small mammals of which no less than 225 were meadow mice.
Hawks build large-bulky nests of sticks placing them usually well up in large trees, and lay, as a rule, four eggs which are generally whitish, blotched with brown. The Marsh Hawk is an exception. Its nest built largely of grasses, is placed on the ground in marshes and the eggs, often numbering six and rarely eight, are bluish white unmarked.
The Owls nest in holes in trees or banks, or, in some instances, an old Hawk or Crow nest may be occupied. The eggs usually number three to five and are always pure white.