Natricidae
Natrix astreptophora (Seoane, 1884) - Iberian Grass Snake
![Adult. April 2006, La Sauceda, PN Alcornocales, Andalusia, ES](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000455-5c2545c257/Natrix_astreptophora_07.jpg?ph=7c8850cb7a)
Adult. April 2006, La Sauceda, PN Alcornocales, Andalusia, ES
![No collar, iris orange](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000456-d5388d538a/Natrix_astreptophora_06.jpg?ph=7c8850cb7a)
No collar, iris orange
![Juvenile. October 2003, Castañar de Ibor, Extremadura, ES](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000457-523195231b/Natrix_astreptophora_03.jpg?ph=7c8850cb7a)
Juvenile. October 2003, Castañar de Ibor, Extremadura, ES
Natrix helvetica (Lacépède, 1789) - Barred Grass Snake
![Nominate subsp. adult. April 2007, Olloy-sur-Virion, BE](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000458-cb2b0cb2b1/Natrix_helvetica_helvetica_09.jpg?ph=7c8850cb7a)
Nominate subsp. adult. April 2007, Olloy-sur-Virion, BE
![2-4 postoculars, 1 preocular. May 2000, La Brenne, dept. Indre, FR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000459-2a9b02a9b2/Natrix_helvetica_helvetica_06.jpg?ph=7c8850cb7a)
2-4 postoculars, 1 preocular. May 2000, La Brenne, dept. Indre, FR
![N. h. cetti adult. April 1999, U Fangu river, Galéria, dept. Haute-Corse, FR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000460-22b7422b76/Natrix_helvetica_cetti_04.jpg?ph=7c8850cb7a)
N. h. cetti adult. April 1999, U Fangu river, Galéria, dept. Haute-Corse, FR
![N. h. cetti heavily marked juvenile. August 2019, E of Col de Vergio, Haut-Corse, FR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000461-1356c1356f/Natrix_helvetica_cetti_07.jpg?ph=7c8850cb7a)
N. h. cetti heavily marked juvenile. August 2019, E of Col de Vergio, Haut-Corse, FR
![N. h. sicula often with orange snout. April 2010, Mongiana, Calabria, IT](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000464-0670b0670d/Natrix_helvetica_sicula_07.jpg?ph=7c8850cb7a)
N. h. sicula often with orange snout. April 2010, Mongiana, Calabria, IT
![N. h. sicula melanistic individual. April 2010, Mongiana, Calabria, IT](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000465-b3454b3457/Natrix_helvetica_sicula_06.jpg?ph=7c8850cb7a)
N. h. sicula melanistic individual. April 2010, Mongiana, Calabria, IT
Natrix maura (Linnaeus, 1758) - Viperine Snake
![October 2010, Torrent des Mercadal, Menorca, ES](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000462-e6539e653b/Natrix_maura_17.jpg?ph=7c8850cb7a)
October 2010, Torrent des Mercadal, Menorca, ES
![Often viper-like pattern on back. April 2006, Cota Doñana, Andalusia, ES](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000463-435a9435ab/Natrix_maura_13.jpg?ph=7c8850cb7a)
Often viper-like pattern on back. April 2006, Cota Doñana, Andalusia, ES
![2 postoculars, 2 (sometimes 1) preoculars. July 2004, Near Urdos, dept. Pyrénées-Atlantiques, FR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000473-52de852dea/Natrix_maura_11.jpg?ph=7c8850cb7a)
2 postoculars, 2 (sometimes 1) preoculars. July 2004, Near Urdos, dept. Pyrénées-Atlantiques, FR
Natrix natrix (Linnaeus, 1758) - Grass Snake
![Nominate subsp. July 2022, Malexander, Östergötland, SE](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200001553-0dc960dc99/Natrix_natrix_natrix_04_WB.jpg?ph=7c8850cb7a)
Nominate subsp. July 2022, Malexander, Östergötland, SE
![N. n. persa. May 2004, Dadiaforest, Thrace, GR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000467-5261b5261d/Natrix_natrix_persa_09.jpg?ph=7c8850cb7a)
N. n. persa. May 2004, Dadiaforest, Thrace, GR
![N. n. persa. June 2011, Fatsadhika, Kythera, GR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000468-2716a2716b/Natrix_natrix_persa_20.jpg?ph=7c8850cb7a)
N. n. persa. June 2011, Fatsadhika, Kythera, GR
![N. n. schweizeri. May 2006, Milos, Western Cyclades, GR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000469-c83e4c83e7/Natrix_natrix_schweizeri_05.jpg?ph=7c8850cb7a)
N. n. schweizeri. May 2006, Milos, Western Cyclades, GR
![N. n. schweizeri melanistic individual. May 2006, Milos, Western Cyclades, GR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000470-6523b6523e/Natrix_natrix_schweizeri_06.jpg?ph=7c8850cb7a)
N. n. schweizeri melanistic individual. May 2006, Milos, Western Cyclades, GR
Natrix tessellata (Laurenti, 1768) - Dice Snake
![October 2006, near Lake Kaiafas, Peloponnese, GR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000471-b0d56b0d58/Natrix_tessellata_09.jpg?ph=7c8850cb7a)
October 2006, near Lake Kaiafas, Peloponnese, GR
![3-4 postoculars, 2-3 preoculars. June 2009, near Axos, Crete, GR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000472-f1c11f1c12/Natrix_tessellata_15.jpg?ph=7c8850cb7a)
3-4 postoculars, 2-3 preoculars. June 2009, near Axos, Crete, GR
![Melanistic individual. June 2009, Lake Kournas, Crete, GR](https://7c8850cb7a.clvaw-cdnwnd.com/d229ba82dd895b159da6c2cab6dde90a/200000474-3f5183f51a/Natrix_tessellata_17.jpg?ph=7c8850cb7a)
Melanistic individual. June 2009, Lake Kournas, Crete, GR