That Reptile Blog – Reptile, Amphibian and Exotic Pet Care and Information

At least 45 species of non-native reptiles and amphibians have established breeding populations in Florida.  The most notorious of these, the Burmese Python, Python bivittatus, has been much in the news in recent years.  Recently, however, another of the state’s introduced giant constrictors grabbed the headlines.

Uploaded to Wikipedia Commons by Tigerpython

On Sept. 10, 2013, a Northern African Rock Python, P. sebae, killed a 60 pound husky in a suburban yard near the Everglades.  While much has been made of the threats posed by large constrictors, what interested me most about this incident was the fact that the snake involved was quite small by Rock Python standards.  Despite being only 10 foot long and 38 pounds in weight, the snake was able to overcome and kill a 60 pound dog.

Based on my experiences with large constrictors in the Bronx Zoo and the wild, I would guess that the attack was defensive in nature.  The only 60 pound snake meal I’ve witnessed (a White-tailed Deer) involved a 17 foot long, 215 pound Green Anaconda…and its huge body appeared stretched to its limit. Read More »

This is the first in a new series of what I’ll call “Myth-Buster Articles”, which will focus on beliefs or practices that have aroused debate in the herpetological community.  After reviewing the available research and my own and others experiences, I will attempt to sort fact from fiction.  Today I’ll highlight the recent studies that have sought to determine if introduced Burmese Pythons, Python molurus bivittatus (a.k.a. P. b. bivittatus) may eventually spread north and west from their current strongholds in South Florida.  Links to the articles mentioned are included below.

Studies comparing the climate in the USA with that in the Burmese Python’s native range (South and Southeast Asia), including one by the US Geological Survey, have predicted that the huge snakes may eventually range north to Delaware and southern Maryland  and west to California.  In all, 32 states were said to provide possible habitat. Read More »

A recent article in the journal IRCF Reptiles and Amphibians (V17, 1) provides evidence that the African Rock Python (Northern African Python, Python sebae), may have established a breeding population in southern Florida.  The huge constrictors are adapted to take small antelopes and other large animals, and have been killed and consumed people in their native habitat.

Florida’s Introduced Constrictors

At least 45 species of non-native reptiles and amphibians have established breeding populations in Florida; many others have been observed but are not known to be reproducing.  Among these are 2 of the world’s largest snakes, the Burmese Python and the Boa Constrictor.  Other large constrictors, including the Green Anaconda, Yellow Anaconda and White-Lipped Python, have been found at large in Florida.

Anacondas and others Established?

Given the extent of Florida’s wetlands and other densely-vegetated habitats, it is not unlikely that reproduction of other species has occurred unseen.  Anacondas, being aquatic, are especially difficult to find.  Years ago, I was told by a reliable source that an entire litter of Green Anacondas escaped from a roadside zoo near Florida City in the early 1970’s…nothing would surprise me at this point!

Northern African Python Study

The article mentioned above looked at Northern African Python sightings and captures in south Florida from 2002-2009.  In that period, 7 individuals were found in a small (less than 10 square miles) area in Dade County.  Among the captured snakes was an 15.5 foot-long adult female with eggs forming in the oviduct, reproductively active males, and several young-of-the-year.  The ages and sexes of these snakes, and their proximity to one another, suggests a breeding population.

Also notable is the fact that the capture sites were less than 1 mile from the border of the Everglades, an immense habitat that could easily hide other African Rock Pythons.

Recent meals – a Domestic Turkey and a Boat-tailed Grackle – were recovered from 2 of the snakes.

Python Hybrids

The African Rock Pythons were found in an area that abuts or overlaps with the range of Florida’s introduced Burmese Pythons.  The 2 species will mate with one another in captivity; the fertility of the resulting hybrids, and their possible affect on south Florida ecosystems, bears further study.

Further Reading

The African Rock Python in Florida (National Geographic)

Video: Rock Python found in Florida

News Article, Photo: African Rock Python Captured in Florida

Study: Burmese Python Winter Tolerance

Python Sebae image referenced from wikipedia and originally posted by Brian.Gratwicke