Dr. Advait M Jukar, FLS
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amjukar.bsky.social
Dr. Advait M Jukar, FLS
@amjukar.bsky.social
790 followers 530 following 70 posts
Curator of Vert. Paleo @floridamuseum.bsky.social | Curatorial Affiliate, Yale Peabody Museum | Research Associate, Smithsonian’s NMNH | former @uarizona.bsky.social | @georgemasonu.bsky.social & @Reed.edu alumnus. Big fan of nature past and present
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Reposted by Dr. Advait M Jukar, FLS
biodiversitypix.bsky.social
🦣 The Mastodon giganteus of North America /.
Boston: J. Wilson, 1852..

[Source]
Illustration titled "Mastodon Giganteus" from 1852, showing detailed black-and-white drawings of several fossilized mastodon bones. The bones, labeled Fig. 1 to Fig. 6, include long limb bones and joint fragments with rough textures and surface irregularities. Each bone is displayed with anatomical accuracy, highlighting their size and structure. The top of the page states "Plate XXV" with a scale indicating one inch to a foot. The illustration provides a scientific view of the extinct North American mastodon's skeletal features for study.
January 27, 2026 at 11:23 PM
Reposted by Dr. Advait M Jukar, FLS
chrislowery.bsky.social
☄️New Paper!!☄️just out in Geology, in which we re-calibrate the ages of the earliest planktic foraminifera to evolve after the K/Pg mass extinction and found that new species began to appear within 2,000 years (YEARS) of the impact:

pubs.geoscienceworld.org/gsa/geology/...
New species evolved within a few thousand years of the Chicxulub Impact | Geology | GeoScienceWorld
The immediate aftermath of the Cretaceous/Paleogene (K/Pg) mass extinction (ca. 66 Ma) in the marine realm was characterized by the initial recovery of
pubs.geoscienceworld.org
January 21, 2026 at 6:22 PM
Reposted by Dr. Advait M Jukar, FLS
stewiestewart.bsky.social
Mummified cave cheetahs inform rewilding actions in Saudi Arabia

www.nature.com/articles/s43...
Mummified cave cheetahs inform rewilding actions in Saudi Arabia - Communications Earth & Environment
Naturally mummified cheetah remains in a Saudi Arabian cave system with radiocarbon-calibrated ages between about 4,200 and 100 years cluster with Asian as well as West-African sub-species, with impli...
www.nature.com
January 20, 2026 at 6:56 AM
Reposted by Dr. Advait M Jukar, FLS
albertonykus.bsky.social
Bone histology of phorusrhacids (terror birds) indicates rapid, uninterrupted growth (typical of most modern birds but unlike flightless paleognaths such as ostriches and kiwi): anatomypubs.onlinelibrary.wiley.com/doi/10.1002/... 🪶🧪 (📷Dreyer et al.)
Cross-section images of the leg bone of an extinct flightless bird, with close-ups taken through a microscope.
January 19, 2026 at 2:48 PM
Reposted by Dr. Advait M Jukar, FLS
extinctmonsters.bsky.social
Some display cases in the old brontosaur hall at AMNH (1956–1990)
Long museum case with complete phytosaur skeleton centered, larger phytosaur skull to the left, and some sort of slab to the right. Chalk drawings above. Long musuem case with Lycaenops and dicynodont skeletons, assorted therapsid skulls on the wall Square museum case with Allosaurus, Camarasaurus, and other skulls. Header says Jurassic Dinosaurs: The Morrison Fauna. Museum case with partial Diplodocus skeleton. It's a pelvis with some dorsal and caudal verts on either side and one attached femur. A skull on a stand beneath.
January 18, 2026 at 2:19 AM
Reposted by Dr. Advait M Jukar, FLS
montanoceratops.bsky.social
a REALLY cool paper was just posted that describes a new lagertätte from La Rioja Provence, Argentina: A extremophile microorganism site with 3d arthropod bits and plants in a Geothermal field. This site also produces large vertebrate material and sauropod nests. www.frontiersin.org/journals/eco...
a diagram showing the environment of the fossil site. Volcanoes, swamps, and geothermal vents can be seen
January 17, 2026 at 6:12 AM
Reposted by Dr. Advait M Jukar, FLS
anya-hess.bsky.social
🚨New paper out with @alexauderset.bsky.social! We show that the Arabian Sea oxygen minimum zone (OMZ) was better oxygenated during the warm Miocene Climate Optimum than today, but its path to full deoxygenation was slow and complex.
Link to paper: www.nature.com/articles/s43...
Contrasting evolution of the Arabian Sea and Pacific Ocean oxygen minimum zones during the Miocene - Communications Earth & Environment
The Arabian Sea and eastern tropical Pacific oxygen minimum zones were better oxygenated during the warm Miocene, but with regional complexities, according to analysis of trace elements and nitro...
www.nature.com
January 16, 2026 at 5:21 PM
Reposted by Dr. Advait M Jukar, FLS
prehistoricmuseum.bsky.social
Stay turned for an updated age for the Huntington mammoth using the latest and greatest techniques! (4/4)

#FossilFriday
January 16, 2026 at 10:16 PM
Reposted by Dr. Advait M Jukar, FLS
prehistoricmuseum.bsky.social
If the bone preserves enough collagen, it is a good candidate for carbon dating! A small piece of the bone (in this case, a fragmentary rib from the Huntington Mammoth) is cut off using a dremel, weighed, and taken to her collaborator’s lab for analysis. (3/4)
January 16, 2026 at 10:16 PM
Reposted by Dr. Advait M Jukar, FLS
prehistoricmuseum.bsky.social
Her process includes pre-screening the fossils using infrared spectroscopy, where she’s essentially using light to look for collagen preservation in the bone. (2/4)
January 16, 2026 at 10:16 PM
Reposted by Dr. Advait M Jukar, FLS
prehistoricmuseum.bsky.social
New science on the Huntington Mammoth for #FossilFriday!

Yesterday, Dr. Christina Ryder visited our museum to sample fossils for carbon dating. Dr. Ryder and her collaborators are interested in the extinction of Ice Age megafauna in North America, including critters like mammoths & mastodons. (1/4)
January 16, 2026 at 10:16 PM
Reposted by Dr. Advait M Jukar, FLS
floridamuseum.bsky.social
Scientist Spotted 🦏 Advait Jukar, Assistant Curator of Vertebrate Paleontology here at the Museum, quoted in a National Geographic article about woolly rhino tissue recovered from the stomachs of mummified wolf puppies in northeastern Siberia:
www.nationalgeographic.com/science/arti...
🐺🐺
Researchers recover a woolly rhino genome from inside a frozen wolf's stomach
The work marks the first time an Ice Age animal’s complete genome has been recovered from tissue preserved inside another ancient animal.
www.nationalgeographic.com
January 15, 2026 at 7:07 PM
Reposted by Dr. Advait M Jukar, FLS
jack-tamisiea.bsky.social
Thanks to @jcchacond.bsky.social and Sólveig Guðjónsdóttir for chatting with me about their new paper with @lovedalen.bsky.social. Also appreciate Laura Epp and @amjukar.bsky.social for putting the findings in context!

The actual paper is a fascinating read: academic.oup.com/gbe/article/...
Genome Shows no Recent Inbreeding in Near-Extinction Woolly Rhinoceros Sample Found in Ancient Wolf's Stomach
Abstract. Using temporarily spaced high-coverage ancient genomes, we can assess population decline prior to extinction. However, finding suitable ancient r
academic.oup.com
January 15, 2026 at 6:19 PM
Reposted by Dr. Advait M Jukar, FLS
yalepaleoarch.bsky.social
Direct our link to our new paper on the oldest cremation pyre in Africa:

www.science.org/doi/10.1126/...
Earliest evidence for intentional cremation of human remains in Africa
The world’s oldest in situ adult funeral pyre (~9500 years old) shows complex mortuary behaviors among ancient African foragers.
www.science.org
January 3, 2026 at 4:13 PM
Reposted by Dr. Advait M Jukar, FLS
devoevomed.bsky.social
Tldr; sex differences in M/F height is a spandrel…
January 2, 2026 at 8:44 PM
Reposted by Dr. Advait M Jukar, FLS
bruceslieberman.bsky.social
Really excited to have the new issue of Paleobiology @paleosoc.bsky.social out celebrating the 50th anniversary of #punctuatedequilibria #macroevolution #paleobiology #palaeontology #paleontology @nilese.bsky.social www.cambridge.org/core/journal...
Latest issue | Paleobiology | Cambridge Core
Paleobiology
www.cambridge.org
January 2, 2026 at 6:31 PM
Reposted by Dr. Advait M Jukar, FLS
bruceslieberman.bsky.social
Here is our introductory paper to the Paleobiology special volume @paleosoc.bsky.social celebrating the 50th anniversary of #punctuatedequilibria #macroevolution #paleobiology #palaeontology #paleontology @nilese.bsky.social www.cambridge.org/core/journal...
Punctuated equilibria at 50: half a century of stasis, cladogenesis, and macroevolutionary insights | Paleobiology | Cambridge Core
Punctuated equilibria at 50: half a century of stasis, cladogenesis, and macroevolutionary insights - Volume 51 Issue 4
www.cambridge.org
January 2, 2026 at 6:33 PM
Reposted by Dr. Advait M Jukar, FLS
devoevomed.bsky.social
Exactly, but its argument in favor of #Deextinction is itself a logical fallacy; yes, “ecosystems respond to what organisms do, not to how precisely their DNA mirrors the past” but… 🧪

www.columnist24.com/science/8397...
The Perfectionist Fallacy - Columnist24
A growing strand of scientific purism argues that de-extinction efforts must achieve perfect genetic fidelity before they can be taken seriously.
www.columnist24.com
January 2, 2026 at 6:35 PM
Reposted by Dr. Advait M Jukar, FLS
fossilsndcoffee.bsky.social
ACTUAL GOOD NEWS EVERYONE: The Paleontological Research Institution and the Museum of the Earth have made it through the crisis!

Thanks to everyone who shared or donated-every donation mattered! Please share the good news just as widely!⚒️🧪🦑 Together we did #savePRI

www.ithaca.com/news/ithaca/...
‘Every Single Dollar Mattered’: Donations Save Museum of the Earth From Foreclosure
Just days before a year-end foreclosure deadline, the Museum of the Earth has paid off its mortgage following a wide fundraising campaign that rescued the Ithaca area landmark.
www.ithaca.com
January 2, 2026 at 1:29 AM
Reposted by Dr. Advait M Jukar, FLS
peterbrannen.bsky.social
Going to try to be resilient in 2026, like the ammonites in Denmark that survived the dinosaur-killing asteroid and limped on for another ~100,000 years www.nature.com/articles/s41...
Ammonite survival across the Cretaceous–Paleogene boundary confirmed by new data from Denmark - Scientific Reports
We provide a reassessment of the hypothesis of ammonite survival across the Cretaceous–Paleogene (Maastrichtian–Danian) boundary, based on new data from the lower Danian Cerithium Limestone Member at ...
www.nature.com
January 1, 2026 at 5:00 PM
Reposted by Dr. Advait M Jukar, FLS
biodiversitypix.bsky.social
🐘 The land and sea mammals of Middle America and the West Indies..
Chicago: Field Columbian Museum, 1904..

[Source]
Black and white historical illustration showing two views of a tapir skull from the Field Columbian Museum collection. The left side depicts the top view of the skull, highlighting the elongated nasal area and large nasal openings characteristic of tapirs. The right side shows the bottom view, revealing the dental structure with prominent molars and the detailed bone architecture of the palate and jaw. The image is labeled "Tapirella bairdii" indicating the scientific name, and it is part of a zoology plate from a 1904 publication on Middle American and West Indian land and sea mammals.
December 30, 2025 at 3:23 AM
Reposted by Dr. Advait M Jukar, FLS
scifri.bsky.social
A wonderful reminder from physicist and author Sean M. Carroll. 📖
"We have to keep up the romance and the idealist notions of what it means to learn things and to be a better educated person... Take time to learn things. It's one of the best things you could do with your time." —Dr. Sean M. Carroll
December 28, 2025 at 4:12 PM
Reposted by Dr. Advait M Jukar, FLS
biodiversitypix.bsky.social
🦌 Wild animals of North America
Washington, D.C., The National geographical society[c1918]

[Source]
Illustration of a large male moose standing in shallow water near the shore, surrounded by aquatic plants and grasses. The moose has prominent broad, palmate antlers and dark brown fur. It is depicted with some vegetation hanging from its mouth, suggesting it is feeding. In the background, a forest of evergreen trees lines the water’s edge under a pale sky at dusk or dawn. The calm water reflects parts of the moose and surrounding plants. The image is a vintage naturalist drawing from the early 20th century, emphasizing the moose's size and habitat in North America.
December 25, 2025 at 1:23 AM
Reposted by Dr. Advait M Jukar, FLS
johnalroy.bsky.social
The Ecological Register now features an interactive mapping tool that lets you find ecological and palaeontological survey data. You can search using Latin names, English names, and time interval names. Click on a link and you can download all the surveys. The home page lists major data sets.
December 24, 2025 at 12:47 AM
Reposted by Dr. Advait M Jukar, FLS
singerstone.bsky.social
Last Thursday @palaeoverse.bsky.social I shared some of our recent projects, exploring the application of phylogenetic methods and the exciting new wave of Bayesian diversification models.

#paleobiology #paleontology #macroevolution

youtu.be/vd-E4E6iFNg?...
Palaeoverse Lecture Series: Dr. Juan Cantalapiedra - Mammals as a key to evolutionary theory
YouTube video by Palaeoverse
youtu.be
December 22, 2025 at 5:26 PM