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The rattlesnake represents the very acme of serpentine sophistication. It has superlative sensing organs that exploit infra-red and chemo-sensory stimuli to enable it to locate its prey. It is armed with one of the most powerful of all venoms with which it can inject its victims with surgical precision. It is long-lived and produces its young fully formed and immediately capable of fending for themselves.
But it has one vulnerability, one way in which human beings who see rattlesnakes as a threat to their own dominance are able to attack it. In North America, in the northern part of the rattlesnake’s range, winters can be so severe that a cold-blooded snake cannot remain active. So many species that are common elsewhere in North America do not spread far north. Rattlers are among the few that do. They survive the winter by another special adaptation. They have developed the ability to hibernate.
On the prairies of the mid-West and north into Canada, they choose to do so in the burrows of prairie dogs, rodents related to marmots. Elsewhere in the woodlands, they find outcrops of rocks that are riven by deep clefts. But such places are not abundant. As autumn approaches and temperatures fall, great numbers of rattlesnakes set out on long cross-country journeys of many miles following traditional routes to the places where they and their parents before them hibernate each year. Some of these wintering dens may contain a thousand individuals. So those human beings who hate snakes and who, in spite of the rattler’s sophisticated early warning system, believe that they are a constant and lethal threat, are also able, at this season of the year, to massacre rattlesnakes in thousands.
As a consequence one of the most advanced and wonderfully sophisticated of all snakes — perhaps of all reptiles — is now, in many parts of the territories it once ruled, in real danger of extinction.
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