![leave it to beaver youtube leave it to beaver youtube](https://www.cheatsheet.com/wp-content/uploads/2021/01/GettyImages-93368507-1024x801.jpg)
Their whole body seems built for the task.
![leave it to beaver youtube leave it to beaver youtube](https://i.pinimg.com/564x/64/5a/05/645a05ab463207718c083936c5fa132f.jpg)
It’s not just their trademark buck teeth that make beavers so efficient at gnawing down trees and building dams. In fact, a study that compared enamel that had been treated with iron and fluoride found the iron-treated enamel to be even more resistant to acid than enamel treated with fluoride.
![leave it to beaver youtube leave it to beaver youtube](http://1.bp.blogspot.com/-XB6dTgHMxHI/UPoA99h9vkI/AAAAAAAB_Fw/ycFvJohomv0/s1600/1953_itcamefromouterspace_1sheet.jpg)
The iron-rich enamel also makes these teeth more resistant to acid. The front four incisors have iron in their enamel, creating the orange color and making them stronger and more resistant to stress and impact. Their four front teeth, the upper and lower incisors, are long and separated from the rest of their dental arch, creating the characteristic “buck teeth.” Behind the front teeth, beavers have a second layer of lips, which act as a barrier and prevent them from swallowing too much water or splinters.īeavers have 20 teeth, including the four front incisors and an additional 16 molars behind them, which are used for grinding. Like all rodents, beavers have teeth on their upper and lower jaws that are continuously growing, so they are able to gnaw away without wearing them down (in fact, the frequent gnawing and biting actually sharpens their teeth). The lifespan of a beaver in the wild is between 16 and 24 years. As semi aquatic rodents, they are strong swimmers from day one and can hold their breath underwater for about 15 minutes. Beavers always live near water with access to dam-building materials, like trees, branches, and mud. Today, though, the beaver population in North America is on the rise, which is good news for us.īeavers are among the largest rodents in North America, weighing an average of 40 pounds and reaching up to three feet in length (including tail). The North American beaver (Castor canadensis) has lived across North America for thousands of years, but were nearly hunted to extinction by late 1800s due to the demands of the unregulated fur industry.