Jack Stack

Extraordinary animal.

Isn’t this your favorite fish?

Screenshot of my blog with the title "How fish get more bigger"

Reading about whale sharks today.

Alaska N. Schubul, Adam D. Marsh & Ben T. Kligman (2025)

A diverse assemblage of tanystropheid archosauromorphs from the continental interior of Late Triassic Pangea includes a new taxon (Akidostropheus oligos gen. et sp. nov.)

Palaeodiversity 18(1): 99-125
bioone.org/journals/Pal...

I’ve been there but never noticed the fossils! Very cool, will have to look out for this my next time in Michigan.

Kitten grabbing my notebook

Helping me brainstorm my next book.

Oh no!

Omg he is literally me

Fossilized skull of the ray-finned fish Saurichthys

Beautiful specimen of Saurichthys on display at the Smithsonian. Giant radiation of long jawed, predatory fishes found all over the world in the Triassic. I had the pleasure of describing a new species from Texas for my dissertation. news.vt.edu/articles/202...

Not a bio PhD but I like to think I can tell catfish and humans apart

Glyptodont mounted at the Smithsonian

For fossil Friday I choose Glyptodon, such a fascinating animal with extreme adaptations for armor. I wrote about glyptodonts for Fish History here open.substack.com/pub/fishhist...

I’ve made people on the other site so mad they are asking me about catfish pronouns. My blog is making an impact!

The armadillos that chose violence | Fish History Get more from Fish History on Patreon

Post is also available on Patreon!

www.patreon.com/posts/armadi...

The armadillos that chose violence Mortal Combat III: Armadillo time

🧪Latest edition of Mortal Combat is live on Fish History this morning! Learn about the giant armadillos that evolved spiked baseball bats for tails.

open.substack.com/pub/fishhist...

I’ll look into that. Thank you!

Yeah I’ve been extremely frustrated with them. Any success on alternate platforms?

And now he runs a pseudoscience substack that peddles hate. Sad stuff.

This guy is the student of the person who faked all that spider data btw

a person is standing in the middle of a dry grass field . Alt: Cassowary kicking the living shit out of a board

Sneak preview of next week’s issue of Mortal Combat.

He’s a star! Thank you again for letting me use the photo and the help tracking down papers.

My cat sitting at my kitchen table

Poppy is helping with my research.

Also available on Patreon!
www.patreon.com/posts/male-f...

Male fish lie for love How fish lie, cheat, and cannibalize their offspring to survive

🧪Love, deception, and cannibalism in fishes. Learn about it here. Special thanks to @mtanichthys.bsky.social and @fishfetisher.bsky.social for their help/inspiration for this article.
open.substack.com/pub/fishhist...

Discovering a new species in the 21st century | Fish History Get more from Fish History on Patreon

I am in the process of porting my past free posts to Patreon, but all the paid posts are available now! Here is a freebie.

www.patreon.com/posts/discov...

Get more from Fish History on Patreon Jack Stack is your personal Fish Historian

I have decided to explore Patreon as a platform for my work.
Membership will get you access to all my paid posts and will help support my science! Let me be your personal Fish Historian.
patreon.com/FishHistory

Armored rat mount, photo by Jack Stack

Why did nobody tell me that there is a spiked rat? The things you learn at the Smithsonian @smithsonianmag.bsky.social

Foot of the cassowary showing the enlarged toe claw. Photo by Jack Stack

The cassowary is a gorgeous flightless bird that has evolved an enlarged, bony shiv on its second toe as a defensive weapon. Don’t mess with the cassowary!

Some of my favorites

Armadillo skeleton showing armor in profile.

Mounted skeleton of a glyptodont, which is a giant armadillo

A couple of hints for next week’s edition of Fish History. At long last I am writing about mammals.

Science matters: That is why I’m here to fight for you as your personal Fish Historian.