Animal Size

North American beaver size: How big do they get?

How big does a North American beaver get? Here is an overview over the average adult age:

A grown North American beaver (Castor canadensis) reaches an average size of 75.7 cm (2′ 6″).

When born, they have an average size of 0 cm (0′ 0″). During their lifetime of about 15 years, they grow from 415 grams (0.91 lbs) to 18.11 kg (39.93 lbs). Talking about reproduction, North American beavers have 3 babies about 1 times per year. The North American beaver (genus: Castor) is a member of the family Castoridae.

As a reference: Humans reach an average body size of 1.65m (5′ 5″) while carrying 62 kg (137 lbs). A human woman is pregnant for 280 days (40 weeks) and on average become 75 years old.

The average adult size of a North American beaver is  (2' 6

The North American beaver (Castor canadensis) is one of two extant beaver species (the other being the Eurasian beaver, Castor fiber). It is native to North America and introduced in South America (Patagonia) and Europe (primarily Finland and Karelia). In the United States and Canada, the species is often referred to simply as “beaver”, though this causes some confusion because another distantly related rodent, Aplodontia rufa, is often called the “mountain beaver”. Other vernacular names, including American beaver and Canadian beaver, distinguish this species from the other extant beaver species, Castor fiber, which is native to Eurasia. The North American beaver is an official animal symbol of Canada and is the official state mammal of Oregon.

Animals of the same family as a North American beaver

We found other animals of the Castoridae family:

Animals with the same size as a North American beaver

Not that size really matters, but it makes things comparable. So here are a couple of animals that are as big as North American beaver:

Animals with the same litter size as a North American beaver

Here is a list of animals that have the same number of babies per litter (3) as a North American beaver:

Animals with the same life expectancy as a North American beaver

Completely different animals, but becoming as old as a North American beaver:

Animals with the same weight as a North American beaver

As a comparison, here are some other animals that weight as much as the Castor canadensis: