Shrew
Shrews can be seen in almost every corner of the world: from the tundra plains to the desert. Some types of shrews are poisonous, like the Northern short-tailed shrew (which lives in North America) and the bicolored shrew, also known as the bicolored white-toothed shrew (which lives in Europe).
The saliva of another type of poisonous shrew, the Eurasian water shrew, contains a paralyzing substance, making it one of the few venomous mammals.
Shrews are not dangerous for humans, though their bites can be painful and will create some pain or swelling that will disappear after a few days.