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Caucasian viper
Vipera kaznakovi (Viperidae) is a species of Caucasian viper famous for its venom, which is more potent than that of most other vipers.  
Unlike other species of vipers of this complex, red and orange tones prevail in coloration of Vipera kaznakovi. There are wide, zigzag-looking strip of black or dark-brown color on the upper side of the body. This black back strip can look like zigzag or have characters of a straight wide black line. 
This species up to 60 cm long is endemic to the Caucasus. It is widespread on the south-west slopes of the Big Caucasus Ridge from pass Mihajlovski through Abkhazia, the western Georgia, Adjaria down to village Hopa in the north of Turkey.
Caucasian viper is regarded as Endangered species on the IUCN Red List, because its area of occupancy is less than 500 km2, its distribution is severely fragmented, and there is continuing decline due to overcollecting for the pet trade and in the extent and quality of its habitat. 
References: [1] - [2] - [3]
Photo credit: ©Larsa Darafeyenka
Locality: unknown

libutron:

Caucasian viper

Vipera kaznakovi (Viperidae) is a species of Caucasian viper famous for its venom, which is more potent than that of most other vipers.  

Unlike other species of vipers of this complex, red and orange tones prevail in coloration of Vipera kaznakovi. There are wide, zigzag-looking strip of black or dark-brown color on the upper side of the body. This black back strip can look like zigzag or have characters of a straight wide black line. 

This species up to 60 cm long is endemic to the Caucasus. It is widespread on the south-west slopes of the Big Caucasus Ridge from pass Mihajlovski through Abkhazia, the western Georgia, Adjaria down to village Hopa in the north of Turkey.

Caucasian viper is regarded as Endangered species on the IUCN Red List, because its area of occupancy is less than 500 km2, its distribution is severely fragmented, and there is continuing decline due to overcollecting for the pet trade and in the extent and quality of its habitat. 

References: [1] - [2] - [3]

Photo credit: ©Larsa Darafeyenka

Locality: unknown