Priscilla Hollingsworth
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Animal evidence: Castor canadensis

10/30/2014

1 Comment

 
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I think so often when people come out to the Phinizy Swamp, they are hoping to see animals.  I know I am.  Plants are fascinating, and I enjoy looking at them very much.  But where are the animals?

As you know, animals are mobile, and often survival for them depends on not being seen more often than necessary.  Therefore, we people who want to look at them sometimes have to gain satisfaction from interpreting the signs that the animal leaves behind.  In this case, you can tell that beavers are active because of the canal they’ve recently dug on one side of the main stream channel.  And there is a pile of sticks on the stream bank that was made by beavers – it might be part of a lodge.  Since my Swamp Drawing Project is about things that I actually see at the Phinizy Swamp, I’ve indicated a beaver in my drawing only through a dotted outline.
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Beavers are found throughout most of North America.  There is just one species in the New World, Castor canadensis.  There is also a species that is native to Europe and Asia, Castor fiber.  The two beaver species cannot mate because they don’t have the same number of chromosomes.

Castor canadensis is the largest rodent in North America.  Their upper incisors continue to grow throughout their lives, and are continually ground down by chewing on wood.    Beavers close their nostrils and ears as well as their eyes while they dive underwater.  They can even close their mouths behind their front teeth, so that they can dive while carrying a stick in their mouths without ingesting water.  Their back feet are webbed for swimming. 

The beaver is a wetland animal – it lives its life by maintaining wetlands through damming streams.  Many landowners have been irritated when beavers move in and dam up streams, flooding the land.   But it turns out that the wetland creation behaviors of beavers have significant ecological benefits.  Beaver activity tends to increase streambank vegetation and general biodiversity  in dry areas over time; it also creates more open water area even in drought years.

Beavers fell trees to build dams and lodges.  The inner bark and leaves of the tree are a major food source for them.  The lodges are made of sticks, grass, and mud.  They tend to be built so that there is an underwater entrance.  A major function of a dam from a beaver point of view is to ensure water depth around the lodge.
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Beavers are active at night.  They tend to stay in or near the water.  They can submerge for up to 15 minutes.  There is research that indicates they build lodges or repair them in response to the sound of running water. 

Another way you might encounter a beaver is by hearing it.  Beavers have a broad, flat tail that they slap against the surface of the water as a warning to potential predators.  To me, the tail slap can sound like a cement block being dropped into water – it’s startling. 

Beavers are monogamous, but if their partner dies, they will look for someone new.  They live for 10 to 20 years in the wild.  Their main predators in our area are people and probably coyotes.  People kill beavers for sport or for their fur or when they feel that beavers are harming land by building dams.  People also kill beavers by destroying wetlands and through pollution.  


For more information on visiting the Phinizy Swamp: http://phinizycenter.org/
1 Comment
Jude W link
2/19/2021 04:57:58 pm

Helllo nice post

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    Author

    Priscilla Hollingsworth, artist.

    Categories

    All
    Art
    Carl Purdy Music
    Cats
    Ceramics
    Ceramic Sculpture
    Clay Musical Instruments
    Collage
    Drawing
    Dyeing
    Exhibitions
    Flowers
    Folk Art Market
    Game Pieces
    Hand Spinning
    Howard Romero
    Hums & Oms
    Installation Art
    Lightning
    Master Naturalist
    Music And Art
    New Mexico
    Ojo Caliente
    Painting
    Performing Sculpture
    Phinizy Swamp
    Phinizy Swamp
    Porcelain
    Process
    Rainbows
    Rob Foster Music
    Santa Fe
    Sarah Fletcher Photos
    Sculpture
    Sketchbooks
    Snow
    Southern Observatory
    Spring
    Sunset
    Teapots
    Vermont Studio Center
    Water
    Westobou Festival

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