Skip to main content

APHIS Geneticist Finds New Way to Track Invasive Pythons

Posted by Gail Keirn, USDA APHIS Public Affairs Specialist in Animals Plants
Feb 21, 2017
Can you find the snake? A Burmese python peeks out from its hiding place in Florida. APHIS Wildlife Services experts are developing new tools to help track and remove this invasive species. Photo by Lori Oberhofer, National Park Service
Can you find the snake? A Burmese python peeks out from its hiding place in Florida. APHIS Wildlife Services experts are developing new tools to help track and remove this invasive species. Photo by Lori Oberhofer, National Park Service

How do you find something that doesn’t want to be found - something that has evolved to be cryptic, elusive, and stealthy?  That is the question asked of APHIS geneticist Dr. Antoinette Piaggio. She and others at the National Wildlife Research Center (NWRC) - the research arm of the APHIS Wildlife Services program - are investigating new ways to track and locate invasive Burmese pythons.

Burmese pythons have made a home in Florida competing with and feeding on native wildlife. Experts agree that new tools and techniques are crucial to monitoring and controlling the spread of this elusive snake.

“Burmese pythons are semi-aquatic and can be very hard to detect given their elusive nature and cryptic coloration,” states Piaggio. “We’ve developed a new detection method that uses environmental DNA, thereby eliminating the need for seeing or handling snakes.”

The use of environmental DNA (eDNA) is a fairly new technique. Because animals shed DNA into the environment from their skin, saliva or other cells, the presence of these genetic fragments can often be detected. Based on this, NWRC researchers developed a polymerase chain reaction (PCR) method to detect python eDNA at low concentrations in water. Tests showed python eDNA was detectable for up to 96 hours in water. This method presents a promising new tool for monitoring the presence-absence and current distribution of invasive Burmese pythons in Florida.

eDNA is not the only way NWRC researchers are helping State and local officials find and remove Burmese pythons. Last year, USDA was issued a patent for a live snake trap that utilizes two trip pans for the capture of larger, heavier snakes, such as the python.  The pans are spaced such that non-target animals are unlikely to trigger the trap.  Researchers are working with captive pythons at NWRC’s field station in Gainesville, Florida, to evaluate how best to use the trap.

APHIS Wildlife Services provides Federal leadership and expertise to resolve wildlife conflicts to allow people and wildlife to coexist. Working to develop new tools and techniques for reducing damage from invasive wildlife is just one of several key mission areas of the program. Wildlife Services researchers, biologists, and field specialists also address issues related to wildlife disease, aviation safety, livestock predation, endangered and threatened wildlife, and agricultural protection. To learn more, please visit the Wildlife Services website.

April is Invasive Plant, Pest, and Disease Awareness Month.

Category/Topic: Animals Plants

Write a Response

CAPTCHA This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.


May 06, 2014

When I open the APHIS webpage, I think the picture "APRIL IS INVASIVE SPECIES MONTH" is pretty creepy, I really don't enjoy opening the page with that staring at me. the first time I saw it, I really had a nightmare. Wish that didn't have to be there. Thank you.

Aug 02, 2014

Good Job.

Aug 20, 2015

When do they breed? Do they form breeding balls like other large species? If so would it be feasible to trap large amounts of the snakes with actual females or synthetic scents? Same for baited traps that are heated making them more attractive locations. Not really familiar with wild snake behaviors but I figured I would add my 2 cents.

Ben Weaver
Aug 20, 2015

@kvargas24 - thank you for your interest in USDA’s python research. Burmese pythons in south Florida breed during the winter when males seek out females. A recent publication describes a study led by the University of Florida in which researchers inserted transmitters into male pythons and tracked 2 of them to a breeding aggregation consisting of 7 males and 1 female. So, pythons in south Florida can form breeding aggregations, or “balls.” National Wildlife Research Center scientists are currently conducting research with colleagues at James Madison University and the Florida Institute of Technology to isolate the key chemical scents or cues (pheromones) that the pythons use to locate potential mates. The research has shown promise and ultimately we intend to produce a synthetic lure that will increase trapping efficacy and contribute to reducing the python population in the Everglades region.

Apr 30, 2018

cant you use artificially produced female mating scent to lure the invasive snakes to you and then capture them? You'd think you lure 10 or more males at a time which you need to do in order to cut into the 100,000 number reportedly living now in the everglades

Robert Bussert
Sep 22, 2018

I know Florida has a crawling season for mating. Why can't you use artificial female scent to put in your traps to lure the male python?

Ben Weaver
Sep 24, 2018

@Robert Bussert - Thank you for your comment. There are, indeed, scientists examining this concept.

Researchers at USDA’s National Wildlife Research Center and James Madison University are investigating the use of snake pheromones (scent) as attractants for trapping invasive Burmese pythons. Please see the following link for details about that investigation: