How Do Beavers Build Dams?

Beavers are water animals whose diet is tree bark. They are excellent swimmers and wood cutters, and they use the trees they chew down not only for food, but also for building lodges and dams.

Beavers live together in groups. They cut down trees together – one beaver chews while the other rests, and then the second beaver chews while the first rests. The beaver family builds its dam with logs, branches, plants, and rocks plastered together with mud. Building up from the bottom, the beavers use poles to strengthen the dam. Then they add more twigs, brush, water plants, and mud. When finished, the top of the dam is above water.

Beavers constantly repair their dams and lodges, and the dams grow to be very large. They even dig canals from wooded areas to the water to transport logs that are too heavy to carry over land.

One beaver dam in Montana measured 2,140 feet long!


  1. Elmo says

    Yay! It was short and filled wit info. Thanks for helpin me on my paper!!!

  2. Anonymous says

    That is so amazing.
    Pretty genius if i have to say so myself (:
    Beavers are soo cool :D

  3. anonomyous says

    thx sooooooooo much cuz i hav 2 write y & how beavers make love i mean dams and that helped soooooooooo much thx by

  4. Anonymous says

    um i have a question, the poles are they like poles? or they make poles out of sticks or something?

  5. matt says

    Thx soooo much my lttle bro ask how bervers bulid their dams so thx soooooooo much =D

  6. katie says

    thanks a lot it helped me on a report and this is so cool beacuse i didnt know about beavers a lot! and i have a question have seen a beaver dam befor i did there so cool!:)

  7. faith4512 says

    how can the beavers make the sticks stay under water because sticks float do they use mud to hold them down or something?

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