Vipera ammodytes (other common names include horned viper, long-nosed viper, nose-horned viper, sand viper) is a viper species found in southern Europe, mainly northern Italy, the Balkans, and parts of Asia Minor. Like all other vipers, it is venomous. It is reputed to be the most dangerous of the European vipers due to its large size, long fangs (up to 13 mm) and high venom toxicity. The specific name, ammodytes, is derived from the Greek words ammos, meaning "sand", and dutes, meaning "burrower" or "diver", despite its preference for rocky habitats. Five subspecies are currently recognized, including the nominate subspecies described here. Description V. ammodytes grows to an average total length (snout-tail) of , although individuals usually measure less than . Maximum length also depends on locality, with northern forms distinctly larger than southern ones. In one field study on Golem Grad island (in North Macedonia), for example, females averaged 35 cm., and males at 37 cm.; the largest captured during the study was a male, at 66 cm. long. This indicates some degree of regional or insular dwarfism. The head is covered in small, irregular scales, that are either smooth or only weakly-keeled; a pair of large supraocular scales also extends beyond the posterior margin of the eye. Ten to thirteen small scales surround each eye, and two rows separate the eye from the supralabials. The nasal scale is large, single (rarely divided), and separated from the rostral by a single nasorostral scale. The rostral scale is wider than it is long. The most distinctive characteristic is a single "horn" on the snout, just above the rostral scale. It consists of approximately nine to seventeen small scales, arranged in two (occasionally three or four) transverse rows. It grows to a length of about and is actually soft and flexible. In southern subspecies, the horn sits vertically upright, while in V. a. Ammodytes it points diagonally forward. The body is covered with strongly keeled dorsal scales, in 21 to 23 rows (rarely 25), at mid-body. The scales bordering the ventrals are smooth or weakly-keeled. Males have anywhere from 133 to 161 ventral scales and 27 to 46 paired subcaudals. Females have between 135 to 164, and 24 to 38, respectively. The anal scale is single. The color pattern is different for males and females. In males, the head has irregular dark brown, dark gray, or black markings. A thick, black