Big Ol‘ Gal
Invasive Burmese Pythons in Southern Florida
Invasive species represent a significant threat to global biodiversity and a substantial economic burden to surrounding communities. In the last 40 years, the Burmese python (Python bivittatus) has invaded southern Florida, including Everglades National Park, Big Cypress National Preserve, and other protected lands.
Native to Africa, Asia, and Australia, many python species have found their way to the United States thanks to their popularity in the pet trade. However, by way of an intentional or accidental release, one such popular pet snake species, the Burmese python, was introduced in southern Florida. They have since established a breeding population and are now considered to be one of the most concerning invasive species in Everglades National Park and other protected lands. These ambush predators compete with other native predators for prey, which ranges from mammals to birds to even other reptiles. In fact, severe mammal declines in Everglades National Park have been linked to the Burmese pythons. WARC researchers are engaged in a number of projects aimed to understand invasive python biology and ecology to help inform environmental managers tasked with control and eradication efforts.
What does a Burmese python look like?
The Burmese python is a nonvenomous, constricting snake with brown blotches bordered by black down the back. In the wild, Burmese pythons often grow to approximately 16 feet but the largest one recorded in Florida was a female that measured approximately 19 feet.
How did a giant constrictor snake species, such as the Burmese python, end up in Florida?
For many decades, Burmese pythons were imported to the United States for the pet trade. The initial wild population is believed to have originated from a small number of escaped, or released, pet pythons at the southern end of Everglades National Park in the early 1980s.
Why was the Burmese python able to establish a population in the Everglades?
In their native range, Burmese pythons prefer subtropical and tropical climates. Southern Florida offers a similar environment; the vast wilderness provides ample habitats where pythons can hide, such as shallow water, wetlands and brush, and physical structures, including gopher tortoise burrows. The Everglades is also largely isolated from human activity, which compounds detection and removal of a species that is known for its cryptic and secretive nature.
How many invasive Burmese pythons are in Florida?
The python population in Florida is expected to be on the scale of tens of thousands of snakes and appears to be growing. On average, Burmese pythons lay 49 eggs in one nest, with an estimated 28.6% of hatchlings surviving to the juvenile stage. However, the clutch size of Burmese pythons increases with body size. Large snakes have been reported to contain as many as 79 to 95 eggs.
Are pythons spreading north of the Everglades?
Burmese pythons have been found north of the Everglades through visual sightings and captures; however, due to the cryptic nature of the species, it is challenging to comprehensively delimit their range with these methods. A new technology called environmental DNA (or eDNA) is being used to track the DNA that is shed by the snakes through sloughed scales, saliva, and excrement. Environmental DNA methods have detected pythons in the northern Everglades in Arthur R. Marshall Loxahatchee National Wildlife Refuge and even beyond Lake Okeechobee.
How have invasive Burmese pythons impacted native species populations in the Greater Everglades?
Burmese pythons consume various mammal and bird species, directly influencing and altering food webs throughout southern Florida. Research has shown that pythons are responsible for diminishing populations of mammals in the Everglades, such as raccoons, opossums, bobcats, rabbits, gray foxes, and white-tailed deer, which have declined by 85 to 100%. Other concerns include the spread of python pathogens and parasites to native species.
What methods have been used to help manage the spread of the Burmese pythons in southern Florida?
What alternative methods might be considered to help control the spread of Burmese pythons?
Multi-year Burmese Python Vital Rate Research Collaborative in the Greater Everglades
Python Vital Rates
State Partnerships in South Florida
Biology, Impacts and Control of Invasive Reptiles in the Everglades
Ecology and Control of Invasive Reptiles in Florida
Mentoring the next generation: USGS, NPS, and University of Florida Cooperative Research Unit Invasive Reptile Intern Program
USGS Coordinated Burmese Python Research Strategy for South Florida (FY21 – FY27)
Using Scout Burmese Pythons and Detector Dogs to Protect Endangered Species in the Florida Keys
Applications of Advanced Tracking and Modeling Tools with Burmese Pythons across South Florida's Landscape
Habitat Selection of the Burmese Python in the Florida Everglades
Environmental DNA (eDNA) Sampling Improves Occurrence and Detection Estimates of Invasive Burmese Pythons and Other Constrictor Snakes in Florida
Investigating Prey of Burmese Pythons using eDNA Methods
Diet of invasive Burmese Pythons (Python molorus bivittatus) in southern Florida, 1995-2020
Size distribution and reproductive data of the invasive Burmese python (Python molurus bivittatus) in the Greater Everglades Ecosystem, Florida, USA, 1995-2021
Droplet digital PCR data for environmental DNA surveys of Burmese pythons in the Greater Everglades Ecosystem
Photo-documented sequences from 01 Jun 2021 - 30 Aug 2021 showing novel interactions between intraguild predators in southern Florida, USA, bobcat and Burmese python
Hatchling Growth Experiment Dataset from Invasive Burmese Pythons Captured in 2015 in Southern Florida
Florida physiological and morphological data from wild and recently captive Python bivittatus 2018-2019
Burmese python acceleration and location data, Everglades National Park, 2010 - 2012
Burmese python environmental DNA data, and environmental covariates, collected from wading bird aggregations and control sites in the Greater Everglades Ecosystem, United States, in 2017
Burmese python environmental DNA data, and associated attributes, collected from ARM Loxahatchee NWR and surrounding areas, from 2014-2016
Sex, length, total mass, fat mass, and specimen condition data for 248 Burmese pythons (Python bivittatus) collected in the Florida Everglades
The wet, subtropical wilderness of Everglades National Park is home to a diversity of Floridian wildlife, but one invader is causing severe changes in these native animal populations. Many of the park’s mammals are declining dramatically as a result of invasive Burmese pythons, according to a recent study by U.S. Geological Survey scientists and partners.
The wet, subtropical wilderness of Everglades National Park is home to a diversity of Floridian wildlife, but one invader is causing severe changes in these native animal populations. Many of the park’s mammals are declining dramatically as a result of invasive Burmese pythons, according to a recent study by U.S. Geological Survey scientists and partners.
Mammalian lures monitored with time-lapse cameras increase detection of pythons and other snakes
Bobcat occupancy, tree islands, and invasive Burmese pythons in an Everglades conservation area
Florida Kingsnake (Lampropeltis floridana) consumes a juvenile Burmese Python (Python molurus bivitattus) in southern Florida
Survey optimization for invasive Burmese pythons informed by camera traps
Telescoping prey selection in invasive Burmese pythons spells trouble for endangered rodents
Maximum clutch size of an invasive Burmese Python (Python bivittatus) in Florida, USA
Natives bite back: Depredation and mortality of invasive juvenile Burmese pythons (Python bivittatus) in the Greater Everglades Ecosystem
Burmese pythons in Florida: A synthesis of biology, impacts, and management tools
Burmese python size and reproduction: Fact vs fiction
Natives bite back! Are Burmese pythons beginning to encounter the resilience of the Everglades Ecosystem?
Size distribution and reproductive phenology of the invasive Burmese python (Python molurus bivittatus) in the Greater Everglades Ecosystem, Florida, USA
Egg retention in wild-caught Python bivittatus in the Greater Everglades Ecosystem, Florida, USA
Amy Yackel Adams, PhD
Supervisory Research Ecologist
Mark R Sandfoss, PhD
Biologist
Can invasive pythons be eradicated?
The odds of eradicating an introduced population of reptiles once it has spread across a large area is very low – pointing to the importance of prevention, early detection, and rapid response. With the Burmese python now distributed across more than a thousand square miles of southern Florida, including all of Everglades National Park and across the southern coast to Rookery Bay National Estuarine...
Are large constrictor snakes such as Burmese pythons able to kill people? What is the risk? Would this be in the wild, or in backyards?
Human fatalities from non-venomous snakes are very rare, probably averaging one or two per year worldwide. All known constrictor-snake fatalities in the United States are from captive snakes; these are split between deaths of snake owners who were purposefully interacting with their pet and deaths of small children or infants in homes where a snake was kept captive as a pet. There have been no...
Could invasive pythons move into cities?
In their native ranges, many python and boa species are often found living in suburban and urban areas. In Florida, Boa constrictors and Northern African pythons live in or adjacent to the Miami metropolitan area. As with alligators, the risk of attacks on humans in urban areas is very low.
How have invasive pythons impacted Florida ecosystems?
Non-native Burmese pythons have established a breeding population in South Florida and are one of the most concerning invasive species in the area. Pythons compete with native wildlife for food, which includes mammals, birds, and other reptiles. Severe declines in mammal populations throughout Everglades National Park have been linked to Burmese pythons, with the most severe declines in native...
How many Burmese pythons inhabit southern Florida?
It is incredibly difficult to estimate the true population numbers of Burmese pythons in South Florida. Burmese pythons can survive in and utilize a variety of habitats found in the region, and many of these areas are difficult to access and effectively survey. Conservatively, tens of thousands of invasive Burmese pythons are estimated to be present in the Greater Everglades region. Learn More...
What should I do if I see a python in the wild?
If you see a python in the wild – or suspect that a snake is a python or an invasive snake – you should take the same precautions for these constrictor snakes as one would take for any wildlife: avoid interacting with or getting close to them. If you are in Everglades National Park, you can report a python sighting to a park ranger. You can also report the animal via the “Ive Got 1” reporting...
Where are Burmese pythons or other large constrictors distributed in Florida?
The Burmese python is now distributed across more than a thousand square miles of southern Florida from coast to coast. This includes Everglades National Park, Biscayne National Park, Crocodile Lake National Wildlife Refuge, Francis S. Taylor Wildlife Management Area, Big Cypress National Preserve, Fakahatchee Strand Preserve State Park, Florida Panther National Wildlife Refuge, Picayune Strand...
Are there invasive reptiles other than Burmese pythons in the United States that people should be concerned about?
Free-ranging, non-native reptiles representing dozens of species from around the world escape or are illegally released in the United States every year. Many of these species fail to establish reproductive populations, but some are successful. Florida is a major transportation hub and has a climate that is suitable for many invasive species across taxonomic groups. Due to the suitable climate, and...
Can Burmese Pythons swim from the Everglades to the Florida Keys?
A number of Burmese pythons have been found on Key Largo, and a few in the Lower Keys. Because pythons regularly escape or are released from captivity, it can be difficult to determine whether a snake encountered in the Keys arrived there by swimming from the mainland or was a former captive pet on the island. Given the python’s ability to disperse via salt water, expansion into neighboring...
Invasive species represent a significant threat to global biodiversity and a substantial economic burden to surrounding communities. In the last 40 years, the Burmese python (Python bivittatus) has invaded southern Florida, including Everglades National Park, Big Cypress National Preserve, and other protected lands.
Native to Africa, Asia, and Australia, many python species have found their way to the United States thanks to their popularity in the pet trade. However, by way of an intentional or accidental release, one such popular pet snake species, the Burmese python, was introduced in southern Florida. They have since established a breeding population and are now considered to be one of the most concerning invasive species in Everglades National Park and other protected lands. These ambush predators compete with other native predators for prey, which ranges from mammals to birds to even other reptiles. In fact, severe mammal declines in Everglades National Park have been linked to the Burmese pythons. WARC researchers are engaged in a number of projects aimed to understand invasive python biology and ecology to help inform environmental managers tasked with control and eradication efforts.
What does a Burmese python look like?
The Burmese python is a nonvenomous, constricting snake with brown blotches bordered by black down the back. In the wild, Burmese pythons often grow to approximately 16 feet but the largest one recorded in Florida was a female that measured approximately 19 feet.
How did a giant constrictor snake species, such as the Burmese python, end up in Florida?
For many decades, Burmese pythons were imported to the United States for the pet trade. The initial wild population is believed to have originated from a small number of escaped, or released, pet pythons at the southern end of Everglades National Park in the early 1980s.
Why was the Burmese python able to establish a population in the Everglades?
In their native range, Burmese pythons prefer subtropical and tropical climates. Southern Florida offers a similar environment; the vast wilderness provides ample habitats where pythons can hide, such as shallow water, wetlands and brush, and physical structures, including gopher tortoise burrows. The Everglades is also largely isolated from human activity, which compounds detection and removal of a species that is known for its cryptic and secretive nature.
How many invasive Burmese pythons are in Florida?
The python population in Florida is expected to be on the scale of tens of thousands of snakes and appears to be growing. On average, Burmese pythons lay 49 eggs in one nest, with an estimated 28.6% of hatchlings surviving to the juvenile stage. However, the clutch size of Burmese pythons increases with body size. Large snakes have been reported to contain as many as 79 to 95 eggs.
Are pythons spreading north of the Everglades?
Burmese pythons have been found north of the Everglades through visual sightings and captures; however, due to the cryptic nature of the species, it is challenging to comprehensively delimit their range with these methods. A new technology called environmental DNA (or eDNA) is being used to track the DNA that is shed by the snakes through sloughed scales, saliva, and excrement. Environmental DNA methods have detected pythons in the northern Everglades in Arthur R. Marshall Loxahatchee National Wildlife Refuge and even beyond Lake Okeechobee.
How have invasive Burmese pythons impacted native species populations in the Greater Everglades?
Burmese pythons consume various mammal and bird species, directly influencing and altering food webs throughout southern Florida. Research has shown that pythons are responsible for diminishing populations of mammals in the Everglades, such as raccoons, opossums, bobcats, rabbits, gray foxes, and white-tailed deer, which have declined by 85 to 100%. Other concerns include the spread of python pathogens and parasites to native species.
What methods have been used to help manage the spread of the Burmese pythons in southern Florida?
What alternative methods might be considered to help control the spread of Burmese pythons?
Multi-year Burmese Python Vital Rate Research Collaborative in the Greater Everglades
Python Vital Rates
State Partnerships in South Florida
Biology, Impacts and Control of Invasive Reptiles in the Everglades
Ecology and Control of Invasive Reptiles in Florida
Mentoring the next generation: USGS, NPS, and University of Florida Cooperative Research Unit Invasive Reptile Intern Program
USGS Coordinated Burmese Python Research Strategy for South Florida (FY21 – FY27)
Using Scout Burmese Pythons and Detector Dogs to Protect Endangered Species in the Florida Keys
Applications of Advanced Tracking and Modeling Tools with Burmese Pythons across South Florida's Landscape
Habitat Selection of the Burmese Python in the Florida Everglades
Environmental DNA (eDNA) Sampling Improves Occurrence and Detection Estimates of Invasive Burmese Pythons and Other Constrictor Snakes in Florida
Investigating Prey of Burmese Pythons using eDNA Methods
Diet of invasive Burmese Pythons (Python molorus bivittatus) in southern Florida, 1995-2020
Size distribution and reproductive data of the invasive Burmese python (Python molurus bivittatus) in the Greater Everglades Ecosystem, Florida, USA, 1995-2021
Droplet digital PCR data for environmental DNA surveys of Burmese pythons in the Greater Everglades Ecosystem
Photo-documented sequences from 01 Jun 2021 - 30 Aug 2021 showing novel interactions between intraguild predators in southern Florida, USA, bobcat and Burmese python
Hatchling Growth Experiment Dataset from Invasive Burmese Pythons Captured in 2015 in Southern Florida
Florida physiological and morphological data from wild and recently captive Python bivittatus 2018-2019
Burmese python acceleration and location data, Everglades National Park, 2010 - 2012
Burmese python environmental DNA data, and environmental covariates, collected from wading bird aggregations and control sites in the Greater Everglades Ecosystem, United States, in 2017
Burmese python environmental DNA data, and associated attributes, collected from ARM Loxahatchee NWR and surrounding areas, from 2014-2016
Sex, length, total mass, fat mass, and specimen condition data for 248 Burmese pythons (Python bivittatus) collected in the Florida Everglades
Big Ol‘ Gal
The wet, subtropical wilderness of Everglades National Park is home to a diversity of Floridian wildlife, but one invader is causing severe changes in these native animal populations. Many of the park’s mammals are declining dramatically as a result of invasive Burmese pythons, according to a recent study by U.S. Geological Survey scientists and partners.
The wet, subtropical wilderness of Everglades National Park is home to a diversity of Floridian wildlife, but one invader is causing severe changes in these native animal populations. Many of the park’s mammals are declining dramatically as a result of invasive Burmese pythons, according to a recent study by U.S. Geological Survey scientists and partners.
Mammalian lures monitored with time-lapse cameras increase detection of pythons and other snakes
Bobcat occupancy, tree islands, and invasive Burmese pythons in an Everglades conservation area
Florida Kingsnake (Lampropeltis floridana) consumes a juvenile Burmese Python (Python molurus bivitattus) in southern Florida
Survey optimization for invasive Burmese pythons informed by camera traps
Telescoping prey selection in invasive Burmese pythons spells trouble for endangered rodents
Maximum clutch size of an invasive Burmese Python (Python bivittatus) in Florida, USA
Natives bite back: Depredation and mortality of invasive juvenile Burmese pythons (Python bivittatus) in the Greater Everglades Ecosystem
Burmese pythons in Florida: A synthesis of biology, impacts, and management tools
Burmese python size and reproduction: Fact vs fiction
Natives bite back! Are Burmese pythons beginning to encounter the resilience of the Everglades Ecosystem?
Size distribution and reproductive phenology of the invasive Burmese python (Python molurus bivittatus) in the Greater Everglades Ecosystem, Florida, USA
Egg retention in wild-caught Python bivittatus in the Greater Everglades Ecosystem, Florida, USA
Amy Yackel Adams, PhD
Supervisory Research Ecologist
Mark R Sandfoss, PhD
Biologist
Can invasive pythons be eradicated?
The odds of eradicating an introduced population of reptiles once it has spread across a large area is very low – pointing to the importance of prevention, early detection, and rapid response. With the Burmese python now distributed across more than a thousand square miles of southern Florida, including all of Everglades National Park and across the southern coast to Rookery Bay National Estuarine...
Are large constrictor snakes such as Burmese pythons able to kill people? What is the risk? Would this be in the wild, or in backyards?
Human fatalities from non-venomous snakes are very rare, probably averaging one or two per year worldwide. All known constrictor-snake fatalities in the United States are from captive snakes; these are split between deaths of snake owners who were purposefully interacting with their pet and deaths of small children or infants in homes where a snake was kept captive as a pet. There have been no...
Could invasive pythons move into cities?
In their native ranges, many python and boa species are often found living in suburban and urban areas. In Florida, Boa constrictors and Northern African pythons live in or adjacent to the Miami metropolitan area. As with alligators, the risk of attacks on humans in urban areas is very low.
How have invasive pythons impacted Florida ecosystems?
Non-native Burmese pythons have established a breeding population in South Florida and are one of the most concerning invasive species in the area. Pythons compete with native wildlife for food, which includes mammals, birds, and other reptiles. Severe declines in mammal populations throughout Everglades National Park have been linked to Burmese pythons, with the most severe declines in native...
How many Burmese pythons inhabit southern Florida?
It is incredibly difficult to estimate the true population numbers of Burmese pythons in South Florida. Burmese pythons can survive in and utilize a variety of habitats found in the region, and many of these areas are difficult to access and effectively survey. Conservatively, tens of thousands of invasive Burmese pythons are estimated to be present in the Greater Everglades region. Learn More...
What should I do if I see a python in the wild?
If you see a python in the wild – or suspect that a snake is a python or an invasive snake – you should take the same precautions for these constrictor snakes as one would take for any wildlife: avoid interacting with or getting close to them. If you are in Everglades National Park, you can report a python sighting to a park ranger. You can also report the animal via the “Ive Got 1” reporting...
Where are Burmese pythons or other large constrictors distributed in Florida?
The Burmese python is now distributed across more than a thousand square miles of southern Florida from coast to coast. This includes Everglades National Park, Biscayne National Park, Crocodile Lake National Wildlife Refuge, Francis S. Taylor Wildlife Management Area, Big Cypress National Preserve, Fakahatchee Strand Preserve State Park, Florida Panther National Wildlife Refuge, Picayune Strand...
Are there invasive reptiles other than Burmese pythons in the United States that people should be concerned about?
Free-ranging, non-native reptiles representing dozens of species from around the world escape or are illegally released in the United States every year. Many of these species fail to establish reproductive populations, but some are successful. Florida is a major transportation hub and has a climate that is suitable for many invasive species across taxonomic groups. Due to the suitable climate, and...
Can Burmese Pythons swim from the Everglades to the Florida Keys?
A number of Burmese pythons have been found on Key Largo, and a few in the Lower Keys. Because pythons regularly escape or are released from captivity, it can be difficult to determine whether a snake encountered in the Keys arrived there by swimming from the mainland or was a former captive pet on the island. Given the python’s ability to disperse via salt water, expansion into neighboring...