Although stories like the ones presented above about snake owners being dangerously unaware that their pets are calmly sizing them up as the main courses of their next meals are interesting, they should be classified with other fictional tales of snake scarelore on the following bases:
- Pythons don't measure their prey before going after their meals: They grab, they squeeze, they eat. There's little fretting in their nature about relative sizes of intended edibles, nor does all that much go into their thinking process.
- For a snake to slurp up large prey whole, it would not only have to be at least as long as its prospective dinner, but it would also have to be capable of ingesting the width of that prey — simply measuring length wouldn't be a sufficiently reliable guide to what a snake could ingest. And while a really big snake could indeed swallow a person's arm, it's quite unlikely that the kinds of snakes typically kept as pets in homes could get their jaws open wide enough to take in an adult human's head and shoulders.
- Those who keep fairly large snakes as pets generally know that it's perfectly normal for their pets to go without food for fairly long periods of time and thus scoff at the notion that a snake's not eating would be cause to rush it to a vet.
- No reasonably informed vet would counsel having a snake put down because it hadn't eaten of late and thus must be planning to make a meal of its owner. (There are other methods for dealing with non-eating snakes, including, in extreme circumstances, force-feeding.)
To look at it another way, if pythons were in the habit of measuring before striking, they'd likely starve. Most of their prey wouldn't willingly wait for them to finish mimicking tape measures before consenting to be eaten; they would hop away to safety as soon as they noticed large snakes stretching out alongside them.
Some elements of the legend were reflected in a February 2008 news story out of Australia involving the swallowing of a family dog by a snake. According to news accounts of the incident, the Peric family (husband, wife, and two children) watched in horror as their chihuahua was gobbled up by a
Regardless of the realities of serpentine behavior, the legend about a snake-measured girl is popular because it gives voice to a widespread fear of that which slithers. Herpetologists aside, many people view snakes as dangerous and unwholesome, perhaps even evil, and therefore feel uncomfortable and somewhat threatened in their presence. Stories like this one serve to confirm such assessments as not only is the "pet" in the tale planning to eat a person, but is stealthily and sneakily working out when to make its move, all under the guise of being affectionate towards the people caring for it. (Interestingly, the fear people seem to be expressing in repeating this story is not of being killed by a snake, but rather of being eaten by one.)
The veterinarian who reveals the true state of things is a stock figure who appears in other urban legends, such as the
Sightings: The "snake measures its intended victim" tale appears in the 2012 Paul Theroux fiction The Lower River.