Biological Impossibilities
What this film shows, snakes just can’t do.

Natural Born Killers (1994)

Natural Born Killers

Killers Mickey and Mallory stumble across a den of rattlesnakes and are bitten. The photography is fast and furious in this scene, but it’s possible to make out that most of the snakes in the medium shots are Western Diamond-backed Rattlesnakes (Crotalus atrox), which is an appropriate choice. In the grainy, blurry, black-and-white closeups of snakes striking, I think they substituted in a harmless Bullsnake or Gopher Snake (Pituophis catenifer); they have similar coloration.

Then they’re off to a drug store to get some rattlesnake antivenin — or, as they call it, “snake-bite juice.” It’s sold out on the shelves, so Mickey goes for the pharmacist, who manages to blurt out, “Don’t carry it. Hospital,” before he gets shot. Here’s the thing: antivenin isn’t stocked by pharmacies, and it would never have been available on the shelves. It’s always administered in hospitals: bite victims would have to be monitored for an allergic reaction to the antivenin, which might be deadlier, in some cases, than the snakebite itself.

Boa vs. Python (2004)

Boa vs. Python

The Sci-Fi channel has a lot to answer for. Much could be said about the risible awfulness of this piece of cable-TV dreck — much, in fact, has been said. It seems a bit unnecessary to nitpick the errors in biology in a movie where a giant python orally pleasures a woman with his tongue (!!!), where the logical response to a giant python loose in a major city’s water supply is to release an equally large boa — and where the giant boa and giant python are almost never seen in the same frame until the last few minutes!

Nevertheless, nitpicking is our business, and I have taken copious notes. Onward!

  1. The giant snakes sound like slavering beasts: they growl, snarl and carry on like the Looney Tunes Tasmanian devil. A young boa constrictor chirps. You do know snakes are deaf, right?
  2. Giant snakes are apparently impervious to gunfire, flame throwers, and ordnance capable of levelling small villages in Bulgaria (which is where this atrocity was filmed). That crossbow will totally work, though.
  3. The FBI agent finds a giant individual scale. Snakes don’t have individual scales like fish; they’re an unbroken part of the skin.
  4. Snakes don’t have prehensile tails and don’t use them as weapons, the way, say, iguanas and monitor lizards do.
  5. Betty is a “scarlet queen boa,” which of course does not exist.
  6. “Most snakes are territorial, especially the big constrictors.” No; very few snakes are territorial.
  7. No snake has a heart rate approaching 300 bpm.
  8. Snakes swallow their food whole; they don’t bite, chew or otherwise rip it apart.
  9. They handled the whole inter-species mating and immediate egg-laying thing reasonably enough, but snake eggshells are leathery, not brittle.
  10. Glowing eyes?
  11. Um, guys, pythons can swim. You won’t get away that way.

In a word, yuck. Thank God for the wholly gratuitous nudity 10 minutes in.

Indiana Jones and the Kingdom of the Crystal Skull (2008)

Indiana Jones and the Kingdom of the Crystal Skull

“Rat snakes aren’t that big,” says Indy, as they try to pull him out of the sand pit with one. You said it, Indy; not only that, but I’m not sure anything called a rat snake comes in that size and colour in South America. I’m actually having trouble identifying the species used in this scene; I’m not even sure if it’s a large colubrid or a slender Australian python. Either way, using a large snake as a rope would simply disarticulate every vertebra in its spinal column. This will not save you, Dr. Jones. Then again, in a movie with nuked fridges and easily coopted spider monkeys, this is not the most impossible thing we were asked to believe. Now, as for calling the snake slimy … well, we need to have a sit-down about that.

We’re No Angels (1955)

We're No Angels

Albert’s helpful pet viper, Adolphe, saves the day in this comedy set on Devil’s Island, but he does all of his dirty work — extinguishing the lives of the two villains — off-screen. In fact, we never actually see Adolphe: all his screen time is spent inside his cage, which makes identifying him a moot point. He’s described as “a little snake, about this big,” and “all different colours like a pretty bracelet,” which sounds more like a coral snake than a viper, insofar as French Guyanese snakes are concerned, but there it is. But a snake with a taste for music? “Vipers are very musical reptiles; they’re much more musical than people think,” says Jules (played by Peter Ustinov). I suppose: snakes are as deaf as Beethoven.

Snakes on a Plane (2006)

Snakes on a Plane

Admit it: you’ve been waiting for this one. Much has already been written about the snakes behind Snakes on a Plane, and the questionable snake behaviour and biology has been debunked elsewhere; I wrote something shortly after I saw the film myself. The key points:

  1. The real, live snakes were harmless and handled by stunt doubles or extras; the venomous snakes were either computer generated or shot in isolation.
  2. The real snakes were common pet-store varieties; I spotted Corn Snakes (Elaphe guttata) and several kinds of Common Kingsnake (Lampropeltis getula) and Milk Snake (Lampropeltis triangulum), for example.
  3. The aggressive snake behaviour was attributed to pheromones sprayed on leis, which is creative nonsense. Pheromones will make snakes horny at best, and no one pheromone would have the same effect across so many different species.
  4. The movie correctly points out that snakes aren’t normally that aggressive, hence the pheromone plot device.
  5. The computer-generated snakes were larger than nature — and faster. No matter how pissed, most snakes don’t move that fast. Except maybe mambas (Dendroaspis) and coachwhips (Masticophis), and I didn’t see any of those.
  6. Antivenom is easier to find than that.
  7. Snakes are illegal to keep in Hawaii.
  8. Pythons never eat fully grown adult males. Well, hardly ever. Yappy little dogs? Total python food. (At least I can hope.)

The Lady Eve (1941)

The Lady Eve

I must confess that The Lady Eve is one of my favourite movies, and it’s not just because the romantic male lead played by Henry Fonda is a herpetologist. (Two words: Eugene Pallette.) It’s a wonderful and cinematically significant romantic comedy by Preston Sturges. You really should see it.

In the opening scene, Charles Pike and his bodyguard Muggsy are leaving the Amazon with “Emma”, a “rare type of Brazilian glass snake” that mysteriously can be fed “just a couple of flies, a sip of milk and perhaps a pigeon’s egg on Sundays.” (An impossible snake diet.) Emma’s Latin name is given as Columbrina marzditzia, but Emma is in fact played by a Western Longnose Snake (Rhinocheilus lecontei lecontei). Rarely kept in captivity nowadays, but quite a gentle species, and one readily found in southern California.

Later, once Pike has returned home, he asks his butler whether he’s seen a Crotalus colubrinus. (“With pink spots,” Muggsy adds.) “I rejoice to say that I have not, sir,” the butler replies, walking away — with what appears to be a Corn Snake (Elaphe guttata) wrapped around his ankle. Crotalus colubrinus is not only imaginary, it’s an oxymoron if you know your Linnaean binomials.

Harry Potter and the Philosopher’s Stone (2001)

Harry Potter and the Philosopher's Stone

There must not be enough snakes in Britain, because J. K. Rowling was apparently unaware of two key snake facts when she wrote the early scene with Harry and the snake — a Burmese Python (Python molurus bivittatus) in the movie, a Boa Constrictor (Boa constrictor) in the book. Namely, that snakes have neither eyelids nor ears, which makes it difficult for this one to be winking at and listening to our man Harry. I’ll grant a lot for a fantasy story, mind. I mean, it’s not like owls are smart enough to be trained in postal service either.

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