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
Me watching The Meg as a fish scientist.
November 10, 2025 at 10:35 PM
Me watching The Meg as a fish scientist.
Crocodylians surviving the K-Pg extinction.
November 6, 2025 at 3:24 PM
Crocodylians surviving the K-Pg extinction.
There’s going to be more theropod drama isn’t there.
November 5, 2025 at 5:11 PM
There’s going to be more theropod drama isn’t there.
Early actinopt anatomy in a nutshell
November 3, 2025 at 4:46 PM
Early actinopt anatomy in a nutshell
Settling down to watch football all weekend
November 1, 2025 at 4:31 PM
Settling down to watch football all weekend
Students are dissecting invertebrates today, was really impressed with this grasshopper dissection.
October 30, 2025 at 10:35 PM
Students are dissecting invertebrates today, was really impressed with this grasshopper dissection.
First draft of the response letter going great.
October 28, 2025 at 7:22 PM
First draft of the response letter going great.
The early ray-finned fish worker experience.
October 28, 2025 at 2:39 PM
The early ray-finned fish worker experience.
What kind of bee is this?
October 26, 2025 at 4:33 PM
What kind of bee is this?
Me pretending to know teleost taxonomy
October 17, 2025 at 11:13 PM
Me pretending to know teleost taxonomy
Accidentally made Hemicalypterus (Triassic, western USA) the most metal fish to ever live. Fun with Photoshop! Reconstruction drawing (original) by Sarah Gibson.
October 14, 2025 at 1:42 PM
Accidentally made Hemicalypterus (Triassic, western USA) the most metal fish to ever live. Fun with Photoshop! Reconstruction drawing (original) by Sarah Gibson.
An important scientific diagram I made today @pusheen.bsky.social
October 9, 2025 at 6:43 PM
An important scientific diagram I made today @pusheen.bsky.social
Eternally grateful to share the beauty and joy of nature with students. Love getting out into the field!
October 2, 2025 at 9:07 PM
Eternally grateful to share the beauty and joy of nature with students. Love getting out into the field!
Didn’t like having her picture taken but saw she had caught a spotted lanternfly and wanted to document. What a neat animal!
October 2, 2025 at 2:43 PM
Didn’t like having her picture taken but saw she had caught a spotted lanternfly and wanted to document. What a neat animal!
Love how fish will just evolve a truly horrifying number of teeth to crush shelled creatures. Absolute nightmare, my students love seeing this stuff. From Cynthia Worcester's master's thesis (2012; linked below).
digitalcommons.wku.edu/theses/1215/
digitalcommons.wku.edu/theses/1215/
October 1, 2025 at 2:04 PM
Love how fish will just evolve a truly horrifying number of teeth to crush shelled creatures. Absolute nightmare, my students love seeing this stuff. From Cynthia Worcester's master's thesis (2012; linked below).
digitalcommons.wku.edu/theses/1215/
digitalcommons.wku.edu/theses/1215/
Amazing that a 'tongue bite' evolved in ray-finned fishes as early as the Mississippian! Also I need this exact paper for a Triassic project in the works, couldn't have come out at a better time.
From Giles, Kolmann, and Friedman (2025).
royalsocietypublishing.org/doi/10.1098/...
From Giles, Kolmann, and Friedman (2025).
royalsocietypublishing.org/doi/10.1098/...
September 30, 2025 at 6:45 PM
Amazing that a 'tongue bite' evolved in ray-finned fishes as early as the Mississippian! Also I need this exact paper for a Triassic project in the works, couldn't have come out at a better time.
From Giles, Kolmann, and Friedman (2025).
royalsocietypublishing.org/doi/10.1098/...
From Giles, Kolmann, and Friedman (2025).
royalsocietypublishing.org/doi/10.1098/...
Harvestmen are so cool.
September 20, 2025 at 7:23 PM
Harvestmen are so cool.
Due to a tragic error in the PDF conversion process my figure turned into modern art.
September 19, 2025 at 5:30 PM
Due to a tragic error in the PDF conversion process my figure turned into modern art.
How I feel after getting a 100% on the exam I just wrote for my students.
September 15, 2025 at 3:17 PM
How I feel after getting a 100% on the exam I just wrote for my students.
Crying because I’ll never make a figure as good as this.
September 12, 2025 at 6:09 PM
Crying because I’ll never make a figure as good as this.
Thinking about Erpetoichthys.
September 12, 2025 at 6:02 PM
Thinking about Erpetoichthys.
Finding out I completely accidentally did something correctly and the reviewer is incorrect is the academic equivalent of this:
September 12, 2025 at 1:27 PM
Finding out I completely accidentally did something correctly and the reviewer is incorrect is the academic equivalent of this:
My students rescued a pigeon last night during a bird collision survey, felt weird delivering a pigeon in a door-dash paper bag to an animal rescue. Happy to report the bird is ok despite flying into a window several times, with the right people to take care of it now.
September 5, 2025 at 4:57 PM
My students rescued a pigeon last night during a bird collision survey, felt weird delivering a pigeon in a door-dash paper bag to an animal rescue. Happy to report the bird is ok despite flying into a window several times, with the right people to take care of it now.
The eye alien in every episode.
September 4, 2025 at 9:00 PM
The eye alien in every episode.