There are two datasets included in this entry. The "morph" dataset contains 6 columns of data on brown treesnakes and rats collected prior to and during arena trials for trialing fencing material for multispecies barrier construction. The "trials" dataset includes 25 columns of brown treesnake and rat data collected prior to, during, and after arena trials. There are four data files associated with this data release. They include "BTS_Breach Attempts_29Jun2020.csv" which describes data associated with attempts by brown treesnakes to escape the fence arena' "BTS_Morph_29Jun2020.CSV", which describes morphometrics of captured and trialed snakes; "Rats_Breach Attempts_29Jun2020.csv", which describes attempts to breach the barrier by rats; "Rats_Morph_29Jun2020.csv", which describes morphometrics of captured rats included in the trials.