In Europe the horned nosed viper is the most venomous snake and it lives in Bulgaria! I have only seen it twice. The females are normally bigger and heavier than the males, but the largest horned nosed viper has been a male. The snake has a horn on its head, it is about 5 mm and it is soft and flexible!!! They are manly found in rocky hill sides and very rarely in the woodlands. The snake is not aggressive - it doesn't tend to bite unless it feels threatened. Their main diet is small mammals and birds. Larger pray are struck, released, tracked and swallowed. Smaller pray are are swallowed without using venom. Before mating these snake will have a combat dance and whoever wins gets the female.