_Dealing with the Rodent Pests._--In addition to {113} weeds and insects, there is yet another group of pests, some representatives of which may be found in every neighbourhood. It is composed of rabbits, ground squirrels, prairie dogs, mice, and the like. They all possess long front teeth for gnawing, and constitute the Order of Rodents. Some species destroy fruit trees by gnawing away the bark near the ground, others attack the grain stacked in the field or stored in the granary. As these little sharp-eyed creatures are chiefly nocturnal in their habits, we seldom see them; we see only the ruin they have wrought. In some of the American ports incoming vessels are systematically fumigated to kill the rats for fear they may bring with them the bubonic plague. In April, 1898, while engaged in field natural history work in Hyde County, North Carolina, I found the farms along the north shore of Matamuskeet Lake were overrun by swarms of large brown rats that burrowed in the ground everywhere, and coming out at night wrought havoc and destruction on the farm lands. The whole country was up {114} in arms and the farmers were appealing for State and Federal aid to help them rid the land of this terrible scourge. In short, the rodents, as a class, are regarded as decidedly detrimental to the interests of mankind. [Illustration: Screech Owl and Its Prey] _The Terror That Flies by Night._--Among the chief enemies of rodents in North America are the nineteen species of Owls, untold numbers of which are abroad every night searching through fields and forests for just such creatures as these. The digestive processes of Owls are such that the hard, indigestible portions of their food are disgorged in the form of balls and may often be found beneath their roosting places. One of our most odd-looking birds is the Barn Owl. Being nocturnal in its habits it is rarely seen unless one takes the trouble to climb into unfrequented church towers, the attics of abandoned buildings, or similar places which they seek out for roosting purposes. Some years ago the naturalist, Dr. A. K. Fisher, discovered that a pair of Barn Owls had taken up their abode in one of the towers {115} of the Smithsonion Institution building. He found the floor thickly strewn with pellets composed of bones and fur which these birds and their young had disgorged. He collected two hundred of these {116} and took them to his laboratory. A painstaking examination showed that they contained four hundred and fifty-three skulls. Here is his list made out at the time: two hundred and twenty-five meadow mice, two pine mice, twenty shrews, one star-nosed mole, and one Vesper Sparrow. It is plain to be seen that great good was accomplished in the community by this pair of Owls and their young, for the evil effects of the rodents in life must have far overbalanced the good service of the one useful Vesper Sparrow.