Betrayal: radio-tagged Burmese pythons reveal locations of conspecifics in Everglades National Park

Biological Invasions
By: , and 



The “Judas” technique is based on the idea that a radio-tagged individual can be used to “betray” conspecifics during the course of its routine social behavior. The Burmese python (Python bivittatus) is an invasive constrictor in southern Florida, and few methods are available for its control. Pythons are normally solitary, but from December–April in southern Florida, they form breeding aggregations containing up to 8 individuals, providing an opportunity to apply the technique. We radio-tracked 25 individual adult pythons of both sexes during the breeding season from 2007–2012. Our goals were to (1) characterize python movements and determine habitat selection for betrayal events, (2) quantify betrayal rates of Judas pythons, and (3) compare the efficacy of this tool with current tools for capturing pythons, both in terms of cost per python removed (CPP) and catch per unit effort (CPUE). In a total of 33 python-seasons, we had 8 betrayal events (24 %) in which a Judas python led us to new pythons. Betrayal events occurred more frequently in lowland forest (including tree islands) than would be expected by chance alone. These 8 events resulted in the capture of 14 new individuals (1–4 new pythons per event). Our effort comparison shows that while the Judas technique is more costly than road cruising surveys per python removed, the Judas technique yields more large, reproductive females and is effective at a time of year that road cruising is not, making it a potential complement to the status quo removal effort.

Study Area

Publication type Article
Publication Subtype Journal Article
Title Betrayal: radio-tagged Burmese pythons reveal locations of conspecifics in Everglades National Park
Series title Biological Invasions
DOI 10.1007/s10530-016-1211-5
Volume 18
Issue 11
Year Published 2016
Language English
Publisher Kluwer Academic Publishers
Contributing office(s) Wetland and Aquatic Research Center
Description 12 p.
First page 3239
Last page 3250
Country United States
State Florida
Other Geospatial Everglades National Park
Online Only (Y/N) N
Additional Online Files (Y/N) N
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