i hope you make sure that everything (and i do mean everything) you use in your day to day life has not been tested on animals.
getting "past evidence" would be hard considering that these animals stick within certain ranges in the wild. and a certain temperature range that an animal stays in dosen't always mean it cannot survive in temps that are not "optimal". studies like these happen all the time to determine treats of invaders. i have seen first hand some of these threats. if it wasn't for animal testing, we would not have any of the medications we now have.
even if the animals were not used for the experiment, they would have been killed. when the burms are found by the people who found them (skip snow ect.) they usually kill them and dissect them to see what they have been eating. so at the very least, the animals used for this study are going to preserve a hobby we are all here for.