Ontogenetic shifts in the diet of plains hog-nosed snakes (Heterodon nasicus) revealed by stable isotope analysis

•We combined traditional methods and stable isotopes to study wild snake diets.•Heterodon nasicus shifts from eating lizards and their eggs to eating aquatic turtle eggs.•Following numerous best practices enhances the rigor of this result.•Simulation work with trophic enrichment factors suggests minimal effects.