Jack Stack
@jackstack.bsky.social
Trophy husband, PhD vertebrate paleontologist. 0 time rank 1 wow PVP player. I also write about the history of fishes: https://fishhistory.substack.com/. He/him
If you want birds, you need bugs!#birds #birding #parks
YouTube video by Fish History
youtube.com
January 11, 2026 at 7:35 PM
Can you spot the predator here?
January 10, 2026 at 5:09 PM
Can you spot the predator here?
🧪The first time a student asked me if Jurassic Park could happen in real life I didn’t know exactly why it isn’t possible. I did the research and recorded the answer here. Enjoy!
youtu.be/x9HT9rAj5Go?...
youtu.be/x9HT9rAj5Go?...
Could Jurassic Park happen in real life?
YouTube video by Fish History
youtu.be
January 9, 2026 at 9:59 PM
🧪The first time a student asked me if Jurassic Park could happen in real life I didn’t know exactly why it isn’t possible. I did the research and recorded the answer here. Enjoy!
youtu.be/x9HT9rAj5Go?...
youtu.be/x9HT9rAj5Go?...
Jump scare at the library today
January 9, 2026 at 9:56 PM
Jump scare at the library today
Some of my favorite type of fossils. Shows how diverse animal communities were in these ancient reefs that covered a lot of the Midwest.
During the Silurian Period, 430 million years ago, equatorial reef systems developed in the seas. The reefs were home to all kinds of invertebrates and among the most plentiful were brachiopods, bryozoans, and gastropods, seen in this specimen in our collection.
January 9, 2026 at 8:02 PM
Some of my favorite type of fossils. Shows how diverse animal communities were in these ancient reefs that covered a lot of the Midwest.
Ideal writing conditions
January 6, 2026 at 7:21 PM
Ideal writing conditions
My students finding out that the biggest animal ever is still around blew their minds. How lucky are we to live alongside such giants?
this monster sea creature is EVEN bigger than the legendary MEGALODON... it's called... the blue whale
January 6, 2026 at 4:39 AM
My students finding out that the biggest animal ever is still around blew their minds. How lucky are we to live alongside such giants?
This is why Triassic actinopterygians are fun, I have never once thought I understand them whatsoever
Working on early actinopts is a cycle between thinking you finally understand them and thinking we know absolutely nothing.
January 6, 2026 at 3:59 AM
This is why Triassic actinopterygians are fun, I have never once thought I understand them whatsoever
He’s gone mad!
Brb beginning to Understand the palaeoniscoid
January 6, 2026 at 12:25 AM
He’s gone mad!
🧪 Lecture on Fish History out today!
Trying out recording lectures, listen here for an introduction to Fish History.
open.substack.com/pub/fishhist...
open.substack.com/pub/fishhist...
An Introduction to Fish History
Lecture and greetings for the New Year
open.substack.com
January 4, 2026 at 11:21 PM
🧪 Lecture on Fish History out today!
The NFC central are teams from a dark alternate timeline:
Little Rock Miners
St. Louis Mountain Ibexes
Lexington Equines
Mississippi River Raiders
Little Rock Miners
St. Louis Mountain Ibexes
Lexington Equines
Mississippi River Raiders
the abnormal and highly erratic vibrations produced by the nfc south suggest the possible existence of an nfc central that we are unable to directly observe
January 4, 2026 at 8:40 PM
The NFC central are teams from a dark alternate timeline:
Little Rock Miners
St. Louis Mountain Ibexes
Lexington Equines
Mississippi River Raiders
Little Rock Miners
St. Louis Mountain Ibexes
Lexington Equines
Mississippi River Raiders
Trying out recording lectures, listen here for an introduction to Fish History.
open.substack.com/pub/fishhist...
open.substack.com/pub/fishhist...
An Introduction to Fish History
Lecture and greetings for the New Year
open.substack.com
January 4, 2026 at 8:27 PM
Trying out recording lectures, listen here for an introduction to Fish History.
open.substack.com/pub/fishhist...
open.substack.com/pub/fishhist...
Reposted by Jack Stack
I want to be a better crinoid appreciator
January 2, 2026 at 6:28 PM
I want to be a better crinoid appreciator
One of my favorite animals, love how there is fossil evidence for interactions like this!
open.substack.com/pub/fishhist...
open.substack.com/pub/fishhist...
January 3, 2026 at 4:10 AM
One of my favorite animals, love how there is fossil evidence for interactions like this!
open.substack.com/pub/fishhist...
open.substack.com/pub/fishhist...
My cat when she hasn’t gotten enough attention 2 seconds
January 3, 2026 at 3:02 AM
My cat when she hasn’t gotten enough attention 2 seconds
Sauropod dinosaurs are easily the coolest land animals ever. Not even sure how it’s possible to have a giant plant processing plant be alive, but they did it!
January 1, 2026 at 1:53 AM
Sauropod dinosaurs are easily the coolest land animals ever. Not even sure how it’s possible to have a giant plant processing plant be alive, but they did it!
Love that fish with horrible teeth are becoming my research program. Had to share Dipteronotus ornatus, Middle Triassic of Switzerland. Illustration by Tony Bürgun.
December 31, 2025 at 6:27 PM
Love that fish with horrible teeth are becoming my research program. Had to share Dipteronotus ornatus, Middle Triassic of Switzerland. Illustration by Tony Bürgun.
Thinking about Dorypterus
December 31, 2025 at 3:57 PM
Thinking about Dorypterus
Reposted by Jack Stack
Couldn’t agree more with the idea that we MUST center students in education. Everything we do should be for the students and their learning, not profit for tech companies testing garbage machines.
"We envision a resistance that is...a repudiation of the efficiencies that automated algorithmic education falsely promises: a resistance comprising the collective force of small acts of friction."
"How to Resist AI in Education" by me & @cnygren.bsky.social
www.publicbooks.org/four-frictio...
"How to Resist AI in Education" by me & @cnygren.bsky.social
www.publicbooks.org/four-frictio...
Four Frictions: or, How to Resist AI in Education - Public Books
We are calling for resistance to the AI industry’s ongoing capture of higher education.
www.publicbooks.org
December 26, 2025 at 3:50 PM
Couldn’t agree more with the idea that we MUST center students in education. Everything we do should be for the students and their learning, not profit for tech companies testing garbage machines.
Seems to be a Silurian coral! Probably the oldest fossil I’ve found on my parents property. Thank you for the information from several people.
Invertebrate paleo people: can anyone ID this? Found in glacial till in Michigan and I am not sure what this is.
December 26, 2025 at 1:35 AM
Seems to be a Silurian coral! Probably the oldest fossil I’ve found on my parents property. Thank you for the information from several people.
Invertebrate paleo people: can anyone ID this? Found in glacial till in Michigan and I am not sure what this is.
December 24, 2025 at 9:24 PM
Invertebrate paleo people: can anyone ID this? Found in glacial till in Michigan and I am not sure what this is.
Bring back giant predator salamander things with flat heads!
Frankly the world should look more like Douglas Henderson’s Triassic scenes
December 24, 2025 at 6:44 PM
Bring back giant predator salamander things with flat heads!
Reposted by Jack Stack
Everything alive in the Devonian period tried too hard. “Ooo, look at me, I’m a weird elongated pentagon” Shut up!
March 30, 2024 at 5:52 AM
Everything alive in the Devonian period tried too hard. “Ooo, look at me, I’m a weird elongated pentagon” Shut up!