How big does a beaver grow to be as an adult?

Beavers can reach different sizes depending on the species. The most common beaver species is the North American beaver (Castor canadensis), which lives in North America.

Here are the average measurements for adult North American beavers:

- Length: 3 to 4 feet long (90 to 120 centimeters)

- Weight: 35 to 60 pounds (16 to 27 kilograms)

Some beavers can grow even larger, with some individuals weighing up to 100 pounds (45 kilograms) and reaching lengths of up to 5 feet (150 centimeters).

European beavers (Castor fiber), which live in Europe and parts of Asia, are slightly larger than North American beavers. They can reach lengths of up to 5 feet (150 centimeters) and weigh up to 120 pounds (54 kilograms).

Mountain beavers (Aplodontia rufa), which are found in the western United States and Canada, are much smaller than North American and European beavers. They typically grow to be about 18 inches (45 centimeters) long and weigh around 1.5 pounds (0.7 kilograms).