Demographic characteristics of Snapping Turtles (Chelydra serpentina) observed on roads in Ontario, Canada

These data consist of 2 code files written in R and JAGS and three sets of observations of Snapping Turtles, Chelydra serpenitina, collected on roads in Ontario, Canada, which were assembled to undestand demographic characteristics associated with risk of road mortality in this species at-risk. The first data set is a sample of juvenile carcasses collected by us, or donated by colleagues, from five sites in central and eastern Ontario during 2013–2015. These carcasses were dissected to determine sex based on gonadal morphology, because juveniles lack external secondary sexual characters and sex in Snapping Turtles is not genetically determined. The second dataset records all alive- (AOR) and dead-on-road (DOR) Snapping Turtles observed in Presq'ile Provincial Park, Ontario, during systematic walking and bicycle surveys during 2013–2017. The third data set was collected in 2013–2015 and records all Snapping Turtles encountered on roads Algonquin Provincial Park, Ontario during field work associated with the Algonquin long-term Painted and Snapping Turtle life-history studies. The Algonquin dataset includes opportunistic observations collected outside of formal surveys. Code files contain R and JAGS code for a somatic growth model and R code to construct and parameterize projection matrices for a set of stage structured demographic models.