Which is the smallest predator in world?

The smallest predator in the world is the least weasel, which is native to North America and Europe. The least weasel measures between 11.4 to 21.6 centimeters in length, including the tail, and weighs only around 1 ounce. Despite its small size, the least weasel is a fierce hunter and primarily preys on small rodents and other small animals.