DIY dinosaurs: more dinosaur bone standees
January 25, 2023
Michelle Stocker with an apatosaur vertebra (left) and a titanosaur femur (right), both made from foam core board.
In the last post I showed the Brachiosaurus humerus standee I made last weekend, and I said that the idea had been “a gleam in my eye for a long time”. That’s true, but it got kicked into high gear late in 2021 when I got an email from a colleague, Dr. Michelle Stocker at Virginia Tech. She wanted to know if I had any images of big sauropod bones that she could print at life size and mount to foam core board, to demonstrate the size of big sauropods to the students in her Age of Dinosaurs course. We had a nice conversation, swapped some image files, and then I got busy with teaching and kinda lost the plot. I got back to Michelle a couple of days ago to tell her about my Brach standee, and she sent the above photo, which I’m posting here with her permission.
That’s OMNH 1670, a dorsal vertebra of the giant Oklahoma apatosaurine and a frequent guest here at SV-POW!, and MPEF-PV 3400/27, the right femur of the giant titanosaur Patogotitan, from Otero et al. (2020: fig. 8). (Incidentally, that femur is 236cm [7 feet, 9 inches] long, or 35cm longer than our brachiosaur humerus.) For this project Michelle vectorized the images so they wouldn’t look low-res, and she used 0.5-inch foam core board. She’s been using both standees in her Age of Dinosaurs class at VT (GEOS 1054) every fall semester, and she says they’re a lot of fun at outreach events. You can keep up with Michelle and the rest of the VT Paleobiology & Geobiology lab group at their research page, and follow them @VTechmeetsPaleo on Twitter.
Michelle’s standees are fully rad, and naturally I’m both jealous and desirous of making my own. I’ve been wanting a plywood version of OMNH 1670 forever. If I attempt a Patagotitan femur, I’ll probably follow Michelle’s lead and use foam core board instead of plywood — the plywood Brach humerus already gets heavy on a long trek from the house or the vehicle.
Speaking of, one thing to think about if you decide to go for a truly prodigious bone is how you’ll transport it. I can haul the Brach humerus standee in my Kia Sorento, but I have to fold down the middle seats and either angle it across the back standing on edge, or scoot the passenger seat all the way forward so I can lay it down flat. I could *maybe* get the Patagotitan femur in, but it would have to go across the tops of the passenger seats and it would probably rest against the windshield.
Thierra Nalley and me with tail vertebrae of Haplocanthosaurus (smol) and the giant Oklahoma apatosaur (ginormous), at the Tiny Titan exhibit opening.
As long as I’m talking about cool stuff other people have built, a formative forerunner of my project was the poster Alton Dooley made for the Western Science Center’s Tiny Titan exhibit, which features a Brontosaurus vertebra from Ostrom & McIntosh (1966) blown up to size of OMNH 1331, the largest centrum of the giant Oklahoma apatosaurine (or any known apatosaurine). I wouldn’t mind having one of those incarnated in plywood, either.
I’ll bet more things like this exist in the world. If you know of one — or better yet, if you’ve built one — I’d love to hear about it.
References
- Alejandro Otero , José L. Carballido & Agustín Pérez Moreno. 2020. The appendicular osteology of Patagotitan mayorum (Dinosauria, Sauropoda). Journal of Vertebrate Paleontology, DOI: 10.1080/02724634.2020.1793158
- Ostrom, John H., and John S. McIntosh. 1966. Marsh’s Dinosaurs. Yale University Press, New Haven and London. 388 pages including 65 absurdly beautiful plates.
DIY dinosaurs: building a life-size Brachiosaurus humerus standee
January 23, 2023
Building life-size standees of big dinosaur bones has been a gleam in my eye for a long time. What finally pushed me over the edge was an invitation from Oakmont Outdoor School here in Claremont, California, to come talk about dinosaurs. It was an outdoor assembly, with something like 280 kids in attendance, and most of my show and tell materials are hand-sized and would not show up well from a distance. Plus, I wanted to blow people away with the actual size of big dinosaur bones.
I started with a life-size poster print of FHPR 17108, the complete right humerus of Brachiosaurus from Brachiosaur Gulch in Utah (the story of the discovery and excavation of that specimen is here). I used the image shown above, scaled to print at 7 feet by 3 feet. You can see that print lying on my living room floor in the previous post.
It was simpler and cheaper to get two 2 foot x 4 foot pieces of plywood than one big piece, so that’s what I did. I laid them out on the living room floor, cut out the poster print of the humerus from its background, traced the outline of the humerus onto the plywood, and then took the pieces outside to cut out the humerus shapes with a jigsaw.
The big piece of darker plywood is the brace that holds the two front pieces together. The smaller piece down at the distal end is a sort of foot, level with the bottom of the humerus but wider and flatter to give more stability. I used wood glue and a bunch of screws to hold everything together. Probably more screws than were strictly necessary, but I wanted to build this thing once and then never worry about it again, and screws and glue are cheap.
Even just the plywood outline without the print glued on looked pretty good. Early in the project I dithered on whether to make the thing out of plywood or foam core board. Foam core board would have been cheaper, easier to work with, and a lot lighter, but I also had doubts about its survivability. I want to use this thing for outreach for a long time to come.
To make the thing free-standing I added a kickstand in the back, made from a six-foot board and a hinge.
I used some screw-eyes and steel wire from a picture-hanging kit to add restraints to the kickstand, so it can’t open up all the way and collapse.
I didn’t want the kickstand flopping around during transit, and I also did not want the whole weight of the kickstand hanging cantilevered from the hinge when this thing is being carried horizontally, so I added a couple of blocks on either side for support, and some peel-and-stick velcro to hold the kickstand in place when it’s not being used.
I took the thing to Oakmont Outdoor School this morning and everybody loved it. I think the teachers were just as impressed as the kids. That’s Jenny Adams, the principal at Oakmont, who invited me to come speak.
This was a deeply satisfying project and it didn’t require any complex or difficult techniques. The biggest expense was the big poster print, and the most specialized piece of equipment was the jigsaw. You could save money by going black-and-white or just blowing up an outline drawing on a plotter, by scavenging the plywood instead of buying new (all my old plywood has been turned into stuff already), or by using foam core board or some other lightweight material.
Many thanks to Jenny Adams and the whole Oakmont community for giving me a chance to come speak, and for asking so many excellent questions. However much fun it was for you all, I’m pretty sure it was even more fun for me. And now I have an inconveniently gigantic Brachiosaurus humerus to worship play with!
I am about a great work
January 21, 2023
I’m also teaching in two anatomy courses and in the process of moving residences (hence bins and boxes and whatnot), so the timing’s…not great. But needs must when the devil drives.
Further bulletins as events warrant.
I’m sure you’ve seen things like ChatGPT in the news: programs that can carry out pretty convincing conversations. They are known as Large Language Models (LLMs) and are frequently referred to as being Artificial Intelligence (AI) — but I really don’t like that designation as it implies some understanding.
To try this out, I asked OpenAI Chat this question: “What are the contenders for the title of Biggest Dinosaur, and what is the basis for their various claims?” I picked that because I know a bit about the answer, and in fact wrote an answer myself back in 2015.
Here’s what it came up with:
There are several contenders for the title of “biggest dinosaur,” and their claims are based on different pieces of evidence. The most commonly cited contenders are:
- Argentinosaurus: This is considered to be one of the largest known dinosaurs, with estimates of its length ranging from 110-130 feet (33-40 meters) and a weight of around 100-110 tons. Its size is based on a few fragmented bones, including vertebrae and limb bones, which were found in Argentina.
- Brachiosaurus: This dinosaur is estimated to have been around 85 feet (26 meters) long and weighed around 80-100 tons. Its size is based on several well-preserved specimens that have been found in North America, including a nearly complete skeleton.
- Puertasaurus: This dinosaur is estimated to have been around 85-100 feet (26-30 meters) long and weighed around 80-100 tons. Its size is based on a few bones, including a femur, that were found in Argentina.
- Supersaurus: This dinosaur is estimated to have been around 110-125 feet (33-38 meters) long and weighed around 80-100 tons. Its size is based on a single specimen, a set of vertebrae, that was found in the US.
- Diplodocus: This dinosaur is estimated to have been around 90-115 feet (27-35 meters) long and weighed around 20-40 tons. Its size is based on several well-preserved specimens that have been found in North America.
It’s worth noting that the size of these dinosaurs is approximate and there’s still debate among paleontologists. Also, the weight of these dinosaurs is based on estimations, not real measurements.
At first glance this is a decent answer. It’s certainly better than just saying “Argentinosaurus weighed 100 tons”. But if you know your sauropods, you’ll immediately recognise that this answer is riddled with inaccuracies:
- The Argentinosaurus entry is actually pretty good, although I’ve never seen a 110 ton mass estimate and modern estimates tend to be rather lower than the specified range.
- The Brachiosaurus mass estimate is way off, two or three times as high as it should be.
- More importantly, no remotely complete Brachiosaurus specimen has ever been described, and size estimates are based primarily on its Tanzanian relative Giraffatitan.
- There is no known femur of Puertasaurus. (When I corrected the AI on this, it told me instead that there is a pubis known.)
- Supersaurus is not based on a single specimen, and both of the main specimens that have been described contain plenty of appendicular material.
- The Diplodocus length estimate is a bit inflated, but otherwise not bad. But it’s not clear what it’s doing in a list of five biggest dinosaurs.
- The answer omits some very strong contenders, including Dreadnoughtus and Patagotitan.
- It doesn’t really address the second part of my question — e.g. Supersaurus has a good claim to be longer, but not heaviest; the converse is likely true for Argentinosaurus.
Now here is the real problem: the LLM does well enough to fool people. If it was nonsense from start to end, there would be nothing to fear here, but the plausibility of the answers and the authoritative tone in which they are given lends the many mistakes a credibility that they do not deserve.
Having seen this sort-of-convincing-but-very-wrong reply in a field that I know something about, I would be very very cautious about trusting an LLM to teach me about a field I don’t already know. I’m guessing its replies about space flight, quantum physics and Medieval French literature are going to be similarly flawed (but also, worryingly, similarly convincing to those such as myself who don’t know better.)
There is a very fundamental reason for all these mistakes: as I implied above, LLMs do not understand anything. They just know what phrases occur close to other phrases. They can do amazing things with that one trick, and I can see them being useful as discovery tools. But we’ll go badly wrong when we start trusting them as anything more than a bright but ignorant kid offering suggestions.
So for all the talk of AI having taken huge leaps forward in the last couple of years, I don’t think any such thing has happened. We’ve just got much better at generating plausible text. But there’s no advance in actual understanding.
Get yourselves over to Sauropoda Central!
January 3, 2023
For some bizarre reason, I have only today discovered Sauropoda Central — a sauropod blog written by someone who goes only by the name “Davidow”, but whose introductory post reveals that he is occasional SV-POW! commenter Vahe Demirjian.
It’s a solid blog full of meaty, sauropodolicious nourishment. There are 26 posts to catch up on, going back 2013, but the posting rate has recently picked up.
(I find the background image very distracting — for one thing, it makes it look like the blog’s title is Argentinosaurus huinculensis — but we can look past that.)
Sauropod Vertebra Picture of the Week 