Distribution of different body coloration types in grass snakes based on iNaturalist records. Densely documented western part enlarged in bottom map. Small inset map (top) shows subspecies distribution according to Asztalos et al. (2021a): Natrix natrix natrix – yellow, N. n. vulgaris – red, N. n. moreotica – grey, N. n. scutata – green. Hybrid zones hatched. Note that large dark spots are largely restricted to the Balkans and western Asia Minor (approximately matching the range of N. n. moreotica), where grass snakes with uniform, marbled or mottled body are virtually lacking.

  Part of: Fritz U, Ihlow F (2022) Citizen Science, taxonomy and grass snakes: iNaturalist helps to clarify variation of coloration and pattern in Natrix natrix subspecies. Vertebrate Zoology 72: 533-549. https://doi.org/10.3897/vz.72.e87426