Vipera ursinii

Vipera ursinii is a venomous viper and a very rare species, that is in danger of extinction. It is found in France, Italy, and Greece. Several subspecies are recognized.
Etymology.
The specific name or epithet, "ursinii", is in honor of Italian naturalist (1788–1870).
Description.
Adults average in total length, although specimens of have been reported. Females are larger than males. Although sometimes confused with "V. aspis" or "V. berus", it differs from them in the following characters. The smallest viper in Europe, its body is thick, its head narrow, and its appearance rough. The snout is not upturned. There are always several large scales or plates on the top of the head. The prominently keeled dorsal scales are in only 19 rows, and often dark skin shows between them. It is gray, tan, or yellowish with a dark undulating dorsal stripe, which is edged with black.
Common names.
Meadow viper, Ursini's viper, meadow adder, Orsini's viper, field viper, field adder. Although the following subspecies are currently invalid according to the taxonomy used here, their common names may still be encountered:
Geographic range.
Southeastern France, eastern Austria (extinct), Hungary, central Italy, Serbia, Montenegro, Croatia, Bosnia and Herzegovina, northern and northeastern Republic of Kosovo, North Macedonia, Albania, Romania, northern Bulgaria, Greece, Turkey, northwestern Iran, Armenia, Azerbaijan, Georgia, Russia and across Kazakhstan, Kyrgyzstan and eastern Uzbekistan steppes to China (Xinjiang).
"Vipera ursinii rakosiensis" is native to Hungary although the taxonomic status of this subspecies is disputed (see section "Taxonomy")
The type locality is " ..."monti dell'Abruzzo prossimi alla provincia d'Ascoli"... " (...mountains of Abruzzo near the Province of Ascoli Piceno, Italy...).
Conservation status.
This species is considered to be a Vulnerable species on the IUCN Red List of Threatened Species, due to habitat destruction caused by changes in agricultural practices and climate change in mountain areas, and to collection for the pet trade.
In addition, this species is listed on CITES Appendix I, which means that it is threatened with extinction if trade is not halted, and is a strictly protected species (Appendix II) under the Berne Convention.
"Vipera ursinii" is the most threatened snake in Europe. At least 12 human activities are threatening these animals:
1. Grazing 
2. Mowing
3. Fire
4. Agriculture
5. Roads
6. Constructions
7. Leisure Activities
8. Afforestation 
9. Cynegetic species management
10. Persecution
11. Illegal collection
12. Littering
Taxonomy.
There is high genetic diversity within samples of "Vipera ursinii" and several species may be involved. At least six subspecies may be encountered in modern literature:
Golay et al. (1993) recognize the first four, while Mallow et al. (2003) recognize five and list "V. eriwanensis" and "V. renardi" as valid species. However, McDiarmid et al. (1999), and thus ITIS, feel that more definitive data is necessary before any subspecies can be recognized.