The ImageJ software, developed by the National Institutes of Health (NIH), is a freeware tool for analyzing photographs. It is a useful tool for our purposes of measuring snout-to-vent length (SVL) of Pacific newts, especially those that are curved. As mentioned earlier, it is important to take special note of juveniles, since their loss has a disproportionate impact on population dynamics. For this project, we are defining juveniles as having a snout-to-vent length (SVL) of less than or equal to 5 centimeters or 2 inches.

For instructions, see the Newt Patrol Tutorial (2020-2021) below, section "Measuring Snout-to-Vent Length using ImageJ software":

https://drive.google.com/file/d/111Jdrnt_juRG6UP6TbQpVvRSOSrtd_6A/view