A New “Lady” in Town, Part II: Priscilla the loner mastodon was meatier than a mammoth, but he was no meathead

And now, back to our Priscilla.

Priscilla the Mastodon

The American mastodon starred in the opening chapters of American science. Thomas Jefferson got some mastodon bones from Kentucky and put them on display in the White House in the 1790s.

In the 1790s Wistar, one of the nation's great medical anatomists, had become fascinated with the ancient bones of exotic species. At the White House, to which he had been invited by President Thomas Jefferson, Wistar examined the bones of a mastodon that George Rogers Clark unearthed in 1807 at Bone Lick, Kentucky. Wistar then wrote the detailed description pictured next to the bone.

Jefferson was sure that wild mastodons still roamed the unexplored land west of the Mississippi, so he instructed explorers Lewis and Clark to find them. By 1860, dozens of skeletons adorned the halls of museums in North America.

Despite their early fame, American mastodons were overshadowed by mammoths. The average bull Columbian mammoth is noticeably taller. The big fossil halls in New York City, Denver and Los Angeles exhibit both, and there’s no doubt who is the heavyweight.

However, during the Ice Age in Florida, Nature produced some extremes. Priscilla was an old, old bull. He had arthritis in his lower back, and some stiffness in the shoulders. But he wasn’t crippled by any means — despite his great age, he shows healthy leg joints. Elephant bulls today continue growing throughout their lives, if their diet is healthy. Priscilla must have chosen his food well over 50 or 60 years. He grew an extraordinarily wide pelvis and set of ribs — he’s well over six feet, side to side, across the hips. His leg bone shafts match the length in most mammoths, but Priscilla’s legs are far thicker and stronger.

Priscilla was buff. We know that because fossil leg bones show the size and strength of muscles during life. Where powerful muscles attached to the bone, the surface is roughened and ridged. Priscilla’s limbs are outstanding in the development of muscle-attachment marks. So he was not only unbelievably wide, he was Schwartzeneggerian in muscularity.

Priscilla the Mastodon

Priscilla is especially massive in the forequarters and the low shoulders make him look like a proboscidean fullback, ready to make a first down in a short yardage situation. The gigantic power in the elbow joint means he could thrust forward with the acceleration of a out-sized rhino. Once he decided to charge, few objects — plants or animals — could stand in his way. If he wanted a path through the woods, he just smashed the trees down.

Priscilla was buried in a Florida stream about 13,000 years ago, a time when human hunters were skulking through the continent. Did Priscilla meet a human? No spear point was found with him and his bones show no evidence of being cut by stone knives after death. Spear points and butcher-cuts document human hunting of mammoth at many sites across the continent. But only a few mastodon skeletons carry the CSI evidence of human attack.

What do we know about Priscilla’s social life? Was he solitary? There are hints that mammoths traveled in herds led by wise old matriarchs, just as modern day elephants do. Cave paintings in Europe show many mammoths together. In North America, several mammoth digs came up with multiple specimens, including moms and calves — maybe the result of a herd dying together. The Waco Mammoth museum displays such a site.

More evidence for matriarchal mammoths comes from where male mammoths are buried. At Hot Springs Mammoth trap in South Dakota, nearly 50 Columbian mammoths sank into loose sand and died over a long span of time. All were male, mostly young adults.

In the modern elephant herd structure, matriarchs drive the males away after the boys go through puberty. Then the young fellows live alone or in bachelor groups. And like bachelors of many species, the male elephants are inquisitive, aggressive and do really stupid things. Like plunge into soft sand without thinking.

Mastodons seem to be way different. Multiple skeletons are rarely piled up in single sites. Bachelor groups are unknown. Most mastodon sites contain just a single skeleton. And so, perhaps we should envision Priscilla as being unsociable, like the giant forest-living rhinos today in Asia and Africa. With a hair-trigger temper and distrust of everyone, the mastodon bull might well have been just too frightening for human hunters to pursue.

I imagine being an Ice Age hunter standing at the edge of a Florida forest. I can hear deep tummy rumbles and coarse trumpeting 200 yards in. I can see birch trees flattened. Tree trunks a yard wide splintered.

“Are we going in?” My companion asks.

“Are we nuts?” I reply.

Don’t answer that.

A New “Lady” in Town, Part I: Why Priscilla the mastodon isn’t a mammoth at all

“It’s the biggest gosh darn mastodon I ever saw! Wowzah!

Yes, that’s a direct quote.

It wouldn’t be a lie to say it’s hard to surprise our esteemed Dr. Bob Bakker, Curator of Paleontology. (That would be me.) But Priscilla did it.

“It’s H-U-G-E ! You could fit a Diplodocus torso inside this rib cage!”

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I was standing under the capacious hips of our new cast Mammut americanum, better known as “the American Mastodon.” The stupendous backbone and legs were being hoisted up on cables so the Black Hills Institute staff could attach the head. Mind you, we at HMNS are no strangers to the mastodon — we’ve had a fine cast of a bull on display in our old hall. Big, formidable.

But Priscilla is way off the scale — in life, twice as heavy as the average bull Mammut. And far more massive than our new Columbian mammoth who will co-star in the new fossil hall.

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I’m getting ahead of myself, so let’s back up for a second.

What exactly is a mastodon? And how’s it different from a mammoth (because it is, you know)?

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North America has two fossil mammoths. The famous woolly mammoth, star of the Ice Age movies, lived in the far north, close to the glaciers. The Columbian mammoths were taller and even heavier and stayed further south, away from the frigid realms. For two million years, Columbian mammoth clans and mastodon were neighbors. They’re found together in many Texas Ice Age sites, at the famous La Brea Tar Pits, and scores of other excavations from Florida to Oregon as well.

Sure, from a distance, the mammoth and mastodon do seem similar. Both have big bodies, bulgy bellies, straight legs, short necks and compact skulls with a hole in the forehead where the long trunk attached in life. The tusks are long and curved and there is just one well developed pair in the upper jaw. (Mastodons might have tiny tusk vestiges in the lower jaw too.)

When they were alive, both would run with long strides with their weight supported by wide five-toed paws embedded in thick, cushiony pads. Both would move their limbs in that unusual gait employed by modern elephants — right fore and hind swung back together and forward together, while the left fore and hind went forward when the right limbs went back. And vice versa.

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But the mastodon clan and the mammoth clan separated some 25 million years ago. The short skulls, long upper tusks and well-developed trunks are mostly evolved in parallel from an ancestor who had long jaws and four long tusks — two in the upper jaw, two in the lower.

All mammoths really are genuine elephants, very close kin of the Asian elephant you see in zoos — that’s why scientists trying to clone a woolly mammoth from frozen specimens in Siberia hope to use the egg from a female Asian elephant.

All mammoths have elephant-style molars. Each tooth crown is a gigantic vegetable processor, with many vertical plates of enamel set in a mass of dentine and cement. (Clever system.) As the uppers and lowers grind against each other, the cement and dentine wear away faster than the enamel. So, the enamel ridges stick up a bit more, guaranteeing that the tooth still has multi-edged cutting/chopping/mincing action until the tooth is totally worn out.

Now look into the mouth of our American mastodon and you’ll see the outstanding difference. The teeth are much smaller and simpler and have nothing like the food-processing power of a mammoth’s grinder. Each mastodon tooth is like a human molar or a pig molar. There are four or six main cusps in two rows, one inside and one outside. The total volume of one molar is one-twentieth that of a mammoth of the same body size. And when the enamel outer covering wore away in a mastodon, there were no vertical ridges of enamel left to cut and chop.

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Clearly mastodons had to be more persnickety about their food choices than did the mammoths. Fossil stomach contents show that mammoths had an elephant-like diet: rushes, sedges, grass, branches, clumps of broad-leafed tree leaves. Stomach remnants and food bits caught between molars tell us that mastodons sought out soft bark from birch trees, soft branches, soft leaves, fallen fruit and nuts with just a wee bit of grass as a garnish.

After analyzing the dental differences, you’d predict that mastodons stayed in wetter, more wooded environments, rich in bushes and young trees. Mammoths would, on the contrary, penetrate far across the open meadows, grasslands and even deserts.

The census of fossil sites confirm your prediction.

Mastodon remains are abundant in bogs and swamps and sandbars from rivers flowing though forests. Mammoths, on the other hand, left many skeletons in sand dunes and rivers that flowed through open terrain. Occasionally both do occur in one spot, but usually one or the other dominates.

Stay tuned for Part II, where you’ll get to know Priscilla like you’ve never known a mastodon before.

I Sold My Soul to Science

I have been associated with the Museum in some form or fashion for over 10 years. Not only do I work for the Museum, I live with and am married to the Museum as well.  During this time I generally get asked three questions.  The first question is always, “What is it like to be married to / live with David?” My husband David Temple is the Associate Curator of Paleontology.  If you don’t like rocks and fossils, he will be around to convert you shortly.

People assume that we have some crazy life, but mostly we are just really busy. We truly enjoy being at our house (both at the same time, which makes it more difficult). I like to think that our house is styled after the Victorian period.  Dave likes to think of it as Neo Adams.

We get the weirdest questions about our house. As if we wouldn’t have all the standards that other houses have. So to prove that this is a fact, I have some pictures. (The house is true. Only the names have been changed to protect the innocent.)

We will begin with the kitchen. To prove that we are normal, here is our fridge. Like everyone else, we tack important bits of info to the fridge so they don’t get lost.


Like everyone else, we have scorpion and cobra whiskey on the fridge stored neatly under a Thai head dress. We have the odd assortment of frozen foods, like butterfly wings. And dead animals.

We like coffee in the morning. And we keep our pets next to the coffee maker on the counter.

As for the Dermestid Beetles.  They are actually my pet project.

We are trying to make skeleton mounts for the Education Collections and  I thought that the beetles might help with one or two dried frogs we had managed to acquire. This is about a month into the process.  The frog in this case had been mummified for about a year before giving him to the beetles.  A smaller, fresher frog, only took about two weeks.

I love baking cupcakes. Believe me, there was talk of an intervention. Dave loves to cook.  The kitchen is the central area in our house, as it is for most people.  We often have a variety of projects beside baking or cooking though.

In our kitchen, we have a hutch where we keep cook books. Cook books are safe and normal, I am sure you would agree. Dave collects cookbooks of various cultures and time periods and cuisines.

We have a room in the house that started off as the study/office, but it wasn’t widely used as most of the activities in this room ended up in the kitchen anyway. SO, I claimed it as my sewing room. Quilting often keeps me from killing my family. It is a great creative outlet and I am surrounded by inspiration.

 

Our back yard is often neglected, but we do seem to have an abundance of Aloe Vera for some reason.  Occasionally we water them and call it gardening. Directly next to the Aloe is my bucket o’ bones.  If you have read my previous posts on the Museum’s blog, you will be happy to note that the bones have made it inside and are being sorted. Plus, there is the bullfrog rescue operation Dave has started.

The second question I am always asked is, “What is it like to work at the Museum?”

The Museum is a cruel mistress.  You work long hours on weird projects, often on the weekends and you love every minute of it. The Museum is home.  Your house is where you keep your stuff when not at home. Here are a few shots of my office so you can envision the crazy. Note the Tapir skeleton in the background. 

The third question I am asked is, “You must learn a lot working at a Museum, right?”  You would think so, but yet I seem to be filled with only useless information.  I think that I might have a shot on Jeopardy. So, what have I learned working here?

 I know that the Rock Hyrax’s closest relative is the elephant.

 That Thomas Jefferson fully believed that Lewis and Clark would find a live mammoth when they mapped the west.

 

That the cone snail is one of the most deadly animals in the world, but is also used for pain medication. 

That it is better to have a hippo head than no hippo at all.

 

That the First Lady can’t walk under swordfish

 That the admin elevator is the exact right size for a tapir

 

That the giant squid has the largest eyeball of any animal

 And that it isn’t unusual to find your place of work altered on a daily basis.

 

But most importantly I have learned that without the support of the Museum volunteers, our patrons and the Houston community, the Museum could not provide the quality exhibits and programming that we do!

Science Doesn’t Sleep (4.2.08)

So here’s what went down after you logged off.

The Hubble Telescope found a new black hole. And no, it wasn’t created by CERN.


Creative Commons License photo credit: Bug-E
Um, it’s called Galveston. Researchers at Texas A&M University have confirmed that a “dead zone” has existed off the Texas coast for 22 years – and will likely keep on killin’ on.  

Talk about kicking them while they’re down – new research shows that climate change brought the mammoth species to its knees (foreshadowing, anyone?), but humans definitely delivered the final blow.

Hello, Mr. Tumnus? Scientists at Newcastle University have created the first human/animal embryo.

 Need another reason to help keep a kid into science? Texas ranks top in tech-industry job growth – even as the economy “shrinks.”

Do you like to invent things? Miss the third grade? Think you were robbed when the ant colony beat out your model volcano? Then it’s time to enter Discover Magazine’s Science Fair for a Better Planet. Go on – you might just have the idea that saves us all.