Old World Vipers

• Adder (Vipera berus)  - Features facts, status, biology, distribution, habitat, videos and images, threats, conservation, and related species.
• Adder (Vipera berus)  - Also called Common Viper, information looks at range, habitat, appearance, breeding, diet, behavior, and threats.
• Adder, Common Viper (Vipera berus)  - BBC Wildfacts looks at subspecies, statistics, appearance, distribution, habitat, diet, behavior, breeding, and status.
• Asp (Vipera aspis)  - Encyclopedia article gives locations, appearance, history, and literature.
• Cyclades Blunt-nosed Viper (Macrovipera schweizeri)  - Relates biology, range, habitat, appearance, classification, conservation, status, and threats.
• European Environment Agency: Vipera ursinii  - Explores common names, distribution, references, threat status, sites, and observations.
• Meadow Viper (Vipera ursinii)  - Discusses appearance, classification, status, conservation, range, habitat, related species, and diet.
• Orsini's Viper (Vipera ursinii)  - Provides history and origin, characteristics, description, range, subspecies, diet, habits, lifespan, and habitat.
• Vipera aspis  - Describes the European Asp, including common names, appearance, range, status, habitat, venom, and subspecies.
• Vipera ursinii  - Combines taxonomy and common names with facts about appearance, habitat, status, and range of the Meadow Viper.