Finally, the removal of rubbish and dense vegetation enables the homeowner to easily see and destroy poisonous snakes that may be present. In settled areas, however, where poisonous snakes are particularly abundant and present a serious problem, it may be necessary to take further protective measures.
Dr. C. M. Bogert of the American Museum of Natural History has suggested the use of a quarter-inch mesh wire fence to keep snakes off residential property. This yard-high, snake-proof fence is placed around the house in much the same manner as an ordinary picket fence, except that the bottom must be set about six inches into the ground to prevent snakes forcing their way beneath it. In addition, all gates must be provided with close-fitting sills on the bottoms and sides to insure a completely tight enclosure.
Experiments with fences of this kind were made to determine their effectiveness and to seek possible improvements in their construction, with the result that one important change was made. Copperheads and small rattlesnakes could not get over the vertically-straight fence, but a six-foot rattlesnake used in the experiment was able to climb over it. When the same fence was tilted outward at a 30-degree angle, not even the largest snake was able to reach the top. Although such fences are expensive and difficult to keep in good repair, they may be desirable under some circumstances.
A less costly method of keeping snakes away from residential property has been proposed by the manufacturers of a new chemical that allegedly repels and kills snakes. The product, a granular material with a civet musk odor, is reported by its distributors to kill a snake less than two feet in length if it is exposed longer than 20 seconds. Preliminary tests made at the Houston Zoo indicate that, in spite of claims to the contrary, the material had little effect on the snakes used. Each of more than a dozen different specimens, including examples of all the local poisonous kinds, unhesitatingly crawled through a wide barrier of the repellent that was poured on the ground. In some instances, the snake’s tongue contacted the granules, but none of the test reptiles showed any ill effects from exposure to the chemical. While these crude tests are certainly not conclusive, it would seem advisable to use commercial repellents with some reservations until they can be proved effective. Meanwhile, we can still prevent most snake bites by observing a few simple safe practices.
PROTECTION IN THE FIELD
In the field, where poisonous snakes are more common, they present a greater hazard to human life; consequently, campers, crop farmers and others who spend a great deal of time outdoors should necessarily take more care in avoiding snake bites. Because almost all snake bites are inflicted on the arms or legs of the victim, these limbs require special protection. The use of a little caution, when placing hands or feet where snakes may be partially or completely hidden from view, is the best protection you can give them. This is particularly true when climbing hand-over-hand on rocky ledges, where your hands reach the level of the ledge before your eyes do. Rattlesnakes and copperheads are partial to such rocky hillsides and here, especially during the warm days of early spring, they prefer to coil and sun themselves.
Armadillo and pack rat burrows also make excellent shelters for rattlesnakes, and only a reckless person would find an excuse to reach into one of these holes. Yet one year, in South Texas alone, at least two snake bites occurred when the victims, each in search of small game, reached into armadillo holes and were bitten by rattlesnakes coiled there.
Another way to invite snake bite is to thoughtlessly turn over a log with bare hands or to step over one without first looking to see whether a snake is coiled on the other side. Many snakes, particularly the copperhead and coral snake, are fond of hiding beneath or within decaying logs, as any snake collector will testify, and such a log is at all times to be considered a potential snake den. If a log must be moved, use a long stick as a pry-bar. Stepping over a log will be less risky if boots or high-top shoes are worn, but even then it is safer to see first what is on the other side.
Several types of footwear offer good protection against the bites of most snakes. Especially effective are high-top leather shoes, riding boots, rubber boots or a combination of army “paratrooper shoes” and heavy leather puttees. Probably the best of these is a snakeproof boot made of extra heavy bullhide leather, sold by the Gokey Company, 94 East 4th Street, St. Paul, Minnesota. For protection of the legs above the knees, snakeproof pants that weigh little more than ordinary duck trousers are available. They consist of three thicknesses of duck material and one layer of fine wire mesh, flexible enough to allow easy knee movement. Snakeproof leggings of similar material can be purchased for safeguarding just the lower legs. Recently marketed aluminum leggings furnish good protection in many cases, but some brands tested were too thin and easily damaged; others were too uncomfortable.