It was 2006 and we had recently started radio-tracking about a dozen Kingsnakes (Lampropeltis getula) in a big chunk of longleaf pine forest in southwestern Georgia. Kingsnakes were fascinating to me because they were a big, recognizable species for which we knew next to nothing. In fact, this was one of the first radio-tracking studies conducted on the species. Almost anything we documented would be new to science, so when the two field techs working on the project came into my office to report on what they had observed that day, I was ready to be surprised.
Radio-telemetry is an exciting research tool because it allows you to spend a day in the life of the animal you are tracking. You can find out where the animal sleeps, swims, rests and how it finds its food. These insights are particularly treasured by snake biologists like myself because snakes are so secretive; it is almost impossible to observe them without radio-telemetry but a lot of work goes into catching snakes, implanting them with radio-transmitters, and then tracking the snakes in the field.
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This is me assisting on a Kingsnake surgery, we don’t mess around. |
Kingsnakes are perhaps most famous for their habit of eating other snakes and our study animals did not disappoint. As you can see from the picture above, we lucked out and got to observe one of our Kingsnakes chowing down on a Copperhead (Agkistrodon contortrix). Not only was this incredibly cool to see, but it was also reassuring to know that our animals could easily return to their regular routines after going through the transmitter-implantation surgery.
Fast forward a few years and I am a Ph.D. student at Auburn University. Our Kingsnake study had produced a couple papers related to how much land the animals use as well as the habitats they preferred, this information can now be used to help figure out what Kingsnakes might need to survive in a particular area. This was particularly important to know because people had started to notice that Kingsnake populations across the southeastern United States had started to decline and even disappear. And, nobody knew why. Although our Kingsnake studies were interesting and novel, they didn’t help us figure out why Kingsnake populations were blinking out other than to rule out habitat change as a likely cause of these declines.

Fascinatingly, while Kingsnakes were apparently disappearing over the last few decades, another species was becoming more and more common. Dr. Mount had reported Copperheads to be a rare species but today they are far and away the most commonly observed snake. For biologists that knew about the Kingsnake’s taste for Copperheads, the appeal of generating a convenient hypothesis proved irresistible. Soon an idea started popping up frequently in conversation and also in the newspapers: Kingsnakes are predators of Copperheads, so Copperheads are becoming more common because Kingsnakes are disappearing.
I was skeptical. There was no question that Kingsnakes loved to eat Copperheads, at least they did so frequently. And, the population trends for the two species over the last thirty years in Conecuh National Forest sure seemed to suggest something could have been going on between them. But it still seemed fishy to me. The numbers of Copperheads and Kingsnakes could be changing due to something completely unrelated to each other, like habitat change. Furthermore, snakes weren’t really known to dramatically influence prey populations, particularly when that prey is another species of snake. So, I set out to prove everybody wrong.

I never got the chance.

*** I want to bring up one last point. Many people already know that Kingsnakes eat Copperheads and some folks even catch Kingsnakes wherever they are found and release them into their yards hoping that all the Copperheads will be eaten. I don’t think that’s a good idea. First of all, if your yard was good habitat for Kingsnakes, they would be there already. If you drop off a Kingsnake in a spot that isn’t a good habitat for that species, it will probably wander off and/or die (I covered this when discussing how to relocate rattlesnakes away from your yard). Second of all, moving a strange Kingsnake to your property could actually be bad for the Kingsnakes already there, because the new animal could introduce a disease they aren’t used to. Finally, moving snakes around, especially if they have been held in captivity, might even be illegal in your state. The best way to keep Copperheads away from your house is to make your yard unappealing to snakes.
Photos appear courtesy of Aubrey Heupel and Benjamin McDaniel.
Related Scientific Articles
Steen, D.A., & et al. (in press). Copperheads are abundant where kingsnakes are not: relationships between the abundances of a predator and one of their prey Herpetologica
Steen, D.A., Linehan, J.M., & Smith, L.L. (2010). Multiscale habitat selection and refuge use of common kingsnakes, Lampropeltis getula, in southwestern Georgia Copeia, 2010, 227-231 DOI: 10.1643/CE-09-092
C.T. Winne, & et al. (2007). Enigmatic decline of a protected population of eastern kingsnakes, Lampropeltis getula, in South Carolina Copeia, 2007, 507-519 DOI: 10.1643/0045-8511(2007)2007[507:EDOAPP]2.0.CO;2
Finally:

Our inaugural event is inspired by Partner in Amphibian and Reptile Conservation’s (PARC) Year of the Snake. Today we all published blog posts about the diversity of ecosystem servicesprovided by snakes. We encourage everyone to follow us on Twitter, visit all of our blogs, and help spread the word about our outreach event, we hope the first of many touching on different themes related to the importance of amphibians and reptiles.
Check ’em out!
Life is Short But Snakes are Long: Ecology of Snake Sheds by Andrew Durso @am_durso
Living Alongside Wildlife: Kingsnakes Keep Copperheads in Check by David Steen @AlongsideWild
Nature Afield: Pythons as Model Organismsby Heidi Smith @HeidiKayDeidl
Nature Afield: Pythons as Model Organismsby Heidi Smith @HeidiKayDeidl
Ophidiophilia: Converting Ophidiophobes to Ophidiophiles, One Kid at a Time by Emily Taylor @snakeymama
The Traveling Taxonomist: Snakes of Madagascar: Cultural and Ecological Roles by Mark Scherz @MarkScherz
Social Snakes: Good Neighbors Make a Greater Impact by Melissa Amarello @SocialSnakes
Strike, Rattle, and Roll: Snakes and the Ecology of Fear by Bree Putman @breeput
Australian Museum: When the Frogs Go, the Snakes Follow by Jodi Rowley @jodirowley
SnakeBytes TV: The Brown Tree Snakes of Guam by Brian Barczyk @SnakeBytesTV
SnakeBytes TV: The Brown Tree Snakes of Guam by Brian Barczyk @SnakeBytesTV