Population studies of diminutive species often present unique challenges associated with methods of identifying individuals in a manner that can be reliable and retained over long periods of time. Small snakes present even more difficulties, as many marking methods rely on the use of either invasive implantation of devices, such as passive integrated transponder (PIT) tags, or through mutilation such as branding or scale clipping. Here I present an alternative method by utilizing a flatbed scanner to obtain consistent images of sufficient quality for use in photographic identification of the Common Sharp-tailed Snake (Contia tenuis) using the unique individual pigmentation patterns on the venter of the head. Additionally, I show that HotSpotter© software consistently scored image pairs of known and assessed matches higher than between pairs of known and assessed mismatches using the flatbed scanner imagery. This method provides a repeatable, reliable, non-invasive, and non-mutilating alternative to more traditional methods of identifying individual snakes.
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23 February 2023
SCANNER IMAGING OF COMMON SHARP-TAILED SNAKES (CONTIA TENUIS) FOR INDIVIDUAL IDENTIFICATION
Eric O Olson
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Northwestern Naturalist
Vol. 104 • No. 1
Spring 2023
Vol. 104 • No. 1
Spring 2023
California
Common Sharp-tailed Snake
Contia tenuis
flatbed scanner
Hotspotter
identification
mark