Weasels come in many sizes, but the most notable is the least weasel. It is the smallest carnivore in the world, according to Animal Diversity Web (ADW). They weigh about 1 ounce (25 grams) and grow to just 4 to 10 inches (11 to 26 centimeters) long.

What is the smallest weasel in the world?

The least weasel (Mustela nivalis), which measures 11–26 cm (4–10 inches) long and weighs only 25 grams (0.9 ounce), is the smallest.

Can a weasel fit through a wedding ring?

Nimble, elegant and lithe, the common weasel is this country's, and the world's, smallest carnivore. The male of the species is usually around 11 inches long, but so streamlined that it can squeeze through a space the diameter of a wedding ring.