How Beavers Build Dams | Leave it to Beavers | PBS



Beavers are vegetarians. They gnaw through bark to eat the sugary layer underneath. They've been gnawing through forests for 20 million years. Felling trees with your teeth takes great strength, skill and patience. One technique is to slice halfway through and let the wind do the rest. The Beavers incisors are strengthened with iron, which makes them orange. They grow continuously and even self-sharpen. The pond makes it easier to move around the heavy logs. They need to build their dams. Out of the water, it's a struggle. Stones help weigh down the base. The whole family works together, carefully interlocking the timber. They dredge mud from the pond bottom to seal the dam. Each pond traps several inches of sediment every year so there's plenty of it. the young act as apprentice builders, learning the tricks of the trade. The final results are impressive. In the Rocky Mountains beaver dams slowly filter billions of tons of water. The ponds build up soil and nutrients and help prevent floods and droughts.

47 Comments

  • Drew Thomas

    April 14, 2019

    20 million years? Read the bible

    Reply
  • Being Single

    April 14, 2019

    Animals: We protect Earth
    Humans: We destroy Earth

    Reply
  • dhiraj tiwari

    April 14, 2019

    And there is a specie named Homosapiens think that they are the most advanced civil engineers on the planet.

    Reply
  • Glen Villanueva

    April 14, 2019

    I was expecting despacito song.

    Reply
  • Aieda Wahab

    April 14, 2019

    I hope nobody touches this nature

    Reply
  • Reymond Adelfa

    April 14, 2019

    Are they not illegal loggers?

    Reply
  • Reymond Adelfa

    April 14, 2019

    Are they not illegal loggers?

    Reply
  • saurabh **

    April 14, 2019

    Natures civil engineers …..huge respect??

    Reply
  • Abdul aleq

    April 14, 2019

    Human behavior is there

    Reply
  • kara koç

    April 14, 2019

    some body can call police please ??

    Reply
  • Vlad Hoon

    April 14, 2019

    This is better than Fortnite

    Reply
  • bearsemen

    April 14, 2019

    Can i have one as a pet?

    Reply
  • lewy

    April 14, 2019

    Animal with five fingers seems tend to be clever

    Reply
  • Kashyap Shirodkar

    April 14, 2019

    vegans have joined the chat

    Reply
  • Cameron Rose

    April 14, 2019

    I wonder if a tree has ever fallen and crushed their head while chewing

    Reply
  • Solid Snake

    April 14, 2019

    KISS FRENCH

    Reply
  • Yareth OL

    April 14, 2019

    These beavers are smarter than most humans

    Reply
  • Pluto :

    April 14, 2019

    They look cgi

    Reply
  • J Lee

    April 14, 2019

    Thank you beavers ❤️

    Reply
  • ArwenMeow

    April 14, 2019

    2.9k people hate beavers for some reason

    Reply
  • Asha Sachdev

    April 14, 2019

    बीवर्स तो हम से ज्या दिमाग रखते है। ?☺??

    Reply
  • Make Me Cringe

    April 14, 2019

    What if it bites a human.

    Reply
  • Lucky Boyo

    April 14, 2019

    more more…..

    Reply
  • Hikki 94

    April 14, 2019

    Civil Engineer leave the chat

    Reply
  • First and Last

    April 14, 2019

    Beavers : build dams to save natures..
    Human : build dams to earn money..

    Reply
  • Organic Video

    April 14, 2019

    Amazing animal

    Reply
  • Pinoy Boi

    April 14, 2019

    0:09 KNOW YOU KNOW

    Reply
  • Dr. melon

    April 14, 2019

    Is anyone here from…
    DEATH ROAD TO CANADA!?!?!

    Reply
  • Yellow Fin Aquariums

    April 14, 2019

    Setting up a logging company any beavers out there watching this video want a job where you can openly chop down trees for living, not get harassment for the locals, no license rewuired i trust your expertise in this job.

    Reply
  • muhd idris

    April 14, 2019

    Cute Engineers…

    Reply
  • muhd idris

    April 14, 2019

    Cute overload!

    Reply
  • random video

    April 14, 2019

    Oh my goodness.
    I didn't know that.

    Reply
  • Jlo Stepbystep

    April 14, 2019

    Teeth like chainsaw

    Reply
  • mike angelo

    April 14, 2019

    This animal is danger to our nature. He took down trees like elegal loggers. ???.

    Reply
  • Kep Spark

    April 14, 2019

    Genius! That was brilliant!

    Reply
  • Paul Andoh

    April 14, 2019

    These beavers need to take some reforestation lessons before it's too late.

    Reply
  • shatsang Ashatsang

    April 14, 2019

    2.9k unlike really? They really pretty well must be a critics in nature

    Reply
  • idont wantcorporateretaliation

    April 14, 2019

    It is said logging is one of the most dangerous jobs. This is natural selection in action.

    Reply
  • Jimmy Malngiang

    April 14, 2019

    GOD's beautiful creation is amazing and perfect.

    Reply
  • Blink

    April 14, 2019

    I love how they basically live in water hobbit holes.

    Reply
  • Raj Mc

    April 14, 2019

    Every life on earth serves a purpose for existence.

    Reply
  • chris Ez

    April 14, 2019

    I want one as a pet

    Reply
  • LadyYoop

    April 14, 2019

    Stunning!

    Reply
  • Atda Estrada

    April 14, 2019

    O que esse dentuso tem na cabeça?!

    Reply
  • Mohd Izwan

    April 14, 2019

    I dont know why people dislikes this.

    Reply
  • Visham Ruckhunty

    April 14, 2019

    Oh my goodness those teeth are super strong

    Reply
  • Jeffery Schirm

    April 14, 2019

    Why build dams when you can have erosion , floods , ect. and who needs pools and ponds for wildlife , fish right.

    Reply

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