- 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.
- Hungarian Meadow Viper
- Explores distribution, conservation status, cause of decline, species group, and brief history.
- 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.
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