Because the beaver isn't just an animal; it's an ecosystem!

Category: Beaver Anatomy


I’m so excited to tell you how wrong I’ve been.

For years now I’ve been following the data we had from the very beginning when we were told by so many experts that beavers live 10-15 years. I’ve been very devoted to that fact because I felt it made people less afraid of the beaver “breeding machine”. I remember friendly reporter Joe Eaton wrote in the article about Mom beaver’s death  that the record of the longest living beaver was 19 years in captivity and of course we all considered that a fluke.

I assumed that our Dad beaver was around 11 and at the end of his life when he left us. I knew a colony had been studied at Mountain View Sanitation 10 years before our beavers came and always always figured that was ancient history and at least one of our beavers had descended from them.

I was WRONG.

Yesterday in Emily’s water interview she casually mentioned that beavers live up to 25 years. This was so outside our information that I wrote her to ask about it. She sent back a host of articles on the subject. Apparently beaver are study for LONGEVITY research because they live so long for a rodent.

In fact the only rodent that lives longer than the beaver is the Naked mole rat in Africa.

Now in addition to my wrongness, this is remarkable because we of course know that beavers are awesome for a host of other reasons. But to think that cancer researchers are amazed by their anti-aging abilities is wonderous in a hole new way. Apparently the Longevity of a beaver has been studied and attributed to three things:

Their ability to repair their own DNA when disease strikes, their ability to exert dynamic change on the atoms around them, and their enormous adaptability and capacity to resist stress. Beavers, and you know this but they know it on a cellular level, really don’t stress the small stuff.

Beaver and Naked Mole Rat Genomes Reveal Common Paths to Longevity

Long-lived rodents have become an attractive model for the studies on aging. To understand evolutionary paths to long life, we prepare chromosome-level genome assemblies of the two longest-lived rodents, Canadian beaver (Castor canadensis) and naked mole rat (NMR, Heterocephalus glaber), which were scaffolded with in vitro proximity ligation and chromosome conformation capture data and complemented with long-read sequencing. Our comparative genomic analyses reveal that amino acid substitutions at “disease-causing” sites are widespread in the rodent genomes and that identical substitutions in long-lived rodents are associated with common adaptive phenotypes, e.g., enhanced resistance to DNA damage and cellular stress. By employing a newly developed substitution model and likelihood ratio test, we find that energy and fatty acid metabolism pathways are enriched for signals of positive selection in both long-lived rodents. Thus, the high-quality genome resource of long-lived rodents can assist in the discovery of genetic factors that control longevity and adaptive evolution.

I would point out that the beaver diet relies so greatly on willow which is known to be one of the most regrowing and to stimulate regrowth. In fact willow is used as a rooting compound and it clearly has passed on its magic over the years. Robin of Napa also pointed out that beavers have a surprising ability to not only resist pollutants (such as in Chernobyl) but to transform them!  Making toxins into cleaner brighter less toxic versions of themselves.

To think about this momentous way in which I had misunderstood the beaver lifecycle was startling, But of course it also meant I had to rethink OUR beavers lifecycle. I had always thought our father beaver was descended from the nearby MVSD colony.

Now I think it was him the whole time. He came to Alhambra Creek for his second act, as it were. The study in MVSD took place in 1997, just a decade before dad showed up downtown. I thought he was a child when he came. but now I’m thinking that he was around 11 or 12.

To say that this blew all of my mind yesterday is an understatement. The idea that our father beaver had a family and home a decade before was every bit as shocking as if I had found out that my own father had had another wife, another family another life before I was born. This changes everything because it means that dad was so much larger because he was older than mom. And that mom was such a sweet young thing, which might explain why she was always more able to tolerate people than Dad, who valued his privacy.

Was mom from MVSD too? Was she a relative? Did they meet in his explorations? We cannot know. But we do know this:

Beavers live longer than >23 years. They are way cooler than mole rats.  Dad’s first chapter was probably in MVSD and his second in Alhambra creek. And suggests that in his long life he was probably married three times.

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It’s time to RELEASE THE CRACKEN as they say. All the snark you’ve been saving up in those long conversations with elderly relatives may officially be unfurled now, Ridicule is called for and fully sanctioned.

The author of this fine vehicle for pointing fingers is Rita Rowand from Virginia.

More than one way to catch a fish in Fauquier County

Riverside Preserve in Northern Fauquier County offers a great place to put a line in the Rappahannock River. Nestled off Leeds Manor Road near Orlean, the preserve is donated land now managed by Fauquier Parks and Recreation and is the only county park with access to the Rappahannock.

The Rappahannock offers many species for the freshwater angler to enjoy, including blue catfish, largemouth bass, striped bass and more.

Okay, so it’s a good fishing spot in Virginia. Check. She hops onto a crag and throws in her line and guess what happens next? You’ll never guess.

Soon, movement caught my eye. Something was approaching in the water: a large beaver swimming toward me. His legs paddled quietly upriver while his tail swung back and forth under the water. No sooner had he passed when a second beaver glided past, presumably searching for fish.

Good Lord. Who lets you write a column in the paper? Does everyone in Virginia think that beavers eat fish or are you just uniquely wrong?

Equally sizable, this one was possibly the mate. Beavers live 90% of their lives in the water, and I was lucky to observe these two, as they can be reclusive.

I was feeling pretty horrified until I read those lines more closely, the part about the beaver swimming by with his “tail swinging back and forth” and realized she was actually talking about on otter. Beaver tails never go back and fourth.

So maybe it was looking for fish.

But it wasn’t a beaver. And it wasn’t with its mate. Otters do not hang with their partners like beavers. It’s strictly get some get gone with otters. Oh and, as Robin of Napa pointed out. Since both species sleep on land, neither species spends 90% of their life in the water.

Without disclosing our location (sorry, folks!), I can report we recently pulled a few bass, with David landing a whopping 22-inch largemouth weighing nearly 5 pounds, while I only landed a smaller version of bass.

As I walked back to the car, the frogs were singing their summer song, and the fireflies twinkled. There was no place else I’d rather be.

We can only assume those were actual frogs and fireflies and not crickets and streetlights. But okay. I get it. You had a nice morning fishing. Next time watch this video, okay?

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This article was recently published in the Oregon State science magazine. It’s beautifully written by Katherine Bolesky, and the opening paragraphs transported me to a magical place. I hope you go read the whole thing and appreciate her fully.

Then come back here and let’s talk about how we’re all 60% beaver!

Busy as a Beaver: Scientists Sequence the Animal’s Genome

One of the species to have its genome sequenced was the beaver, specifically, CastorCanadensis. In fact, it was one of the few species to have been sequenced without having disease or food connections.

Sequencing the Beaver Genome

Dr. Blair then described the actual sequencing of the beaver genome, which turns out to be a pretty spectacular science story. It cost $30,000 to sequence the beaver genome here in the United States. It was a crowdsource campaign, meaning all of the money was raised through donations. Oregon State University headed the project , and after about a year raised enough money. There was, however, a problem. The beaver is the Canadian beaver, and for their 150th year of independence Canada wanted to sequence the beaver genome first. Dr. Blair says it was like the space race!

I remember how amazing it was to read about the genome project at OSU and then read that Canada was doing the same thing for its anniversary. I wondered how they made such a similar plan with so little knowledge of each other. Clearly both organizations fail to read THIS WEBSITE everyday, which is a huge oversight.

Canada started after OSU, but had more resources and required less money. Genome sequencing is built into their infrastructure, and so they only needed about $20,000. Our star beaver was named Filbert, a resident of the Oregon Zoo. Canada’s beaver was named Ward. After these two lovely beavers donated some blood, the race was on. Canada ended up winning, by a single day! Dr. Blair said, “It was really funny, depending on what country you were in, in the U.S it was like ‘Oregon State publishes the genome’, no mention of Toronto, and Toronto was like ‘We beat Oregon!’” It ended up being beneficial to have both countries sequence the genome, because they were able to compare and correct mistakes that were made. It turns out that beavers have less base sequences than humans, but share 60% of their genome with us.

It’s funny to look back at our old article from 2017 and see how we were reporting this all at the time. In ”

Your favorite faded genes”

If you’ll remember way back to 2015 (when we all still had health care and social security), you might recall that Oregon State did a crowd funding to raise funds for sequencing a beaver genome. In January. Canada bragged that it was doing one for its 150th anniversary, but when I sent the top researcher news of this, she replied to me, too late! We already did!

The article is dated July of this year. I really enjoyed her style of writing. Did you know humans and beavers share the same toe gene? Embryo toes are webbed in the uterus just like beavers, our gene just ‘turns off’ and the webbing disappears.

Scientists are also now wondering what part of a beaver’s genetic information tells it to build those spectacular dams that are so characteristic. Extinct beavers did not build dams, and so it is a new trait that has arisen. Scientists are hoping to figure out what that gene is, and why it tells the beavers to build those amazing habitats. Dr. Blair told me some beaver dams are so huge they can even be seen from space, the only such engineer besides humans on this planet.

Oooh now that’s interesting. What’s the dam gene? Now you got me curious. But it’s not all about genes, as we saw in Martinez.

Before ending our conversation, Dr. Blair told me her favorite beaver fact, which I never even considered. She said that “they have variations in behavior. We know humans have variations in behavior, we kind of assume animals are all the same, they’re all busy and all diligent, but I’ve been around beavers, and there are some that work harder than others. There’s incredible variation, I mean there are beavers that have bad attitudes. Not only are they sophisticated, they have not gone the route of other social animals, beavers have a lot more personality than we realize”. She even told me that, while doing field work, there was a beaver that would watch her work while munching on it’s lunch, and that some beavers spent much of their time eating while others were being busy beavers.

Well of COURSE. We saw hardworking beavers (like Reed) and smart working beavers (like GQ) and lazy-assed beavers (like the useless bookends). Also beavers that were extremely wary about working hard in front of you but would work like the devil if it was absolutely necessary. (Like Dad).

The Hawthorn effect doesn’t just apply to humans you know, sheesh.

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The castoides skull copy is one our most prized beaver exhibit items. For years we’ve been answering questions about this dinosaur beaver, reporting the slightly incredible research based on isotope analysis that they didn’t eat trees but survived on very small pond weed. People always scoff at that, and say then what are those big teeth for? Which I can never explain.

But Castorides wasn’t the only beaver.

The family of castorids used to contain many members all evolved into their own niche and constrictions. Dipoides was actually smaller than our beaver and some brand new research indicates it miraculously cut trees for food. Wait, what? A beaver the size of a bear lived on pondweed and a beaver the size of a lapdog cut down trees? Well yes. Little trees. Do not ask me why on earth the giant beaver didn’t cut trees and the small beaver did. But that’s evolution for you, Apparently they cut the trees first, because they were hungry, and then when things started freezing their cousins thought, hey maybe there’s a value in building up the water and saving some unfrozen food.

Maybe being the midsized beaver that could do it all made sense in the long run.

Ancient Arctic beavers were cutting down trees for food at least four million years ago – long before they started building dams, study shows

By studying the wood-cutting behaviour of ancient beavers that once roamed the Canadian high Arctic, an international team of scientists has discovered that tree predation – feeding on trees and harvesting wood – evolved in these now-extinct rodents long before dam-building.

This is an important discovery as woodcutting is a key behaviour for modern-day beavers’ capacity to modify, create and maintain habitats.

This new research suggests that tree predation has existed for more than 20 million years, enough time that might have allowed beavers to affect the evolution of certain trees species.

The ancient beavers, belonging to the fossil lineage Dipoides, lived four million years ago and were approximately two-thirds the size of today’s Canadian beavers. They gnawed trees with rounded front teeth, not squared teeth like their modern relatives, and researchers believe this woodcutting behaviour originated for harvesting food, not from a compulsion for building dams.

The study, published today in Scientific Reports, is first-authored by Tessa Plint, a former Western University graduate student currently pursuing a PhD at Heriot-Watt University (UK).

“Ancient animals and ecosystems that thrived in the high Arctic during warmer times in geological history show us a glimpse of what this biome could look like in the future under the effects of global warming in polar regions,” said Plint.

“Today, the beaver has a profound impact on the landscape and is known to increase the biodiversity of the local ecosystem through tree-harvesting and dam building. It’s fascinating to look back in time and figure out how this hyper-specialized toolkit of behaviours came to be.”

At Western’s Laboratory for Stable Isotope Science, researchers examined chemical signatures preserved in ancient beaver bones to figure out what exactly they were eating four million years ago –and, surprisingly to them, it included trees.

So there you have it. Sometimes it looks like you’re suited for one purpose and it turns out you do something completely different and blow them all away. And sometimes you have the perfect seeming qualities, and everyone treats you as a “RINGER” for sure, and you fizzle out and eat pond weed.

Go Figure.


Notice anything different? Maybe something deep blueish? The website got its background color back yesterday! Hurray! Someone in IT just got over being sick or outsourced her job to South Korea where they’re actually getting BETTER and I was able to make the color stick on sunday. So very happy.

I got something about Singapore’s new River Park yesterday and felt very pleased with my detective skills. The flyer said that it had a river cruise where you could “Feed Beavers” and I thought hmm that’s not really very likely. Since there are no actual beavers in Singapore and beavers are nocturnal, Whatever sorry animal you can feed probably isn’t beavers.

I was very pleased with myself when I found this:

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Heh heh heh. What that means is that wildlife parks will sell you anything for a paycheck I guess.

These are dark days and we all need to have our spirits lifted. Check out how this remarkable school choir is coping with the quarantine.

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