How many snakes are venomous and where do they live?
There are approximately 3500 snake species known worldwide, of which 600 species are considered venomous and 200 are considered to be medically relevant. These venomous snakes cause significant morbidity and mortality. Most venomous snake species live in subtropical and tropical regions of the world. However, some venomous species live in regions with cooler climates. The European adder (Vipera berus) can even be found north of the Arctic circle. The Himalayan pit viper (Gloydius Himalayanus) has been found up to 4900 m above sea level.
Several regions are free of venomous snakes: Antarctica, Chile, Ireland, Iceland, Madagascar, New Zealand, and many islands of the Atlantic, the Caribbean, and the eastern Pacific.