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Blood vessels preserved in a broken rib of the largest known T. rex show healing in progress

Blood vessels preserved in a broken rib of the largest known T. rex show healing in progress

New Capabilities

Scotty, the biggest Tyrannosaurus rex on record, died months after its rib fracture began healing, leaving a rare network of mineralized blood vessels

Today: Discovery tops Reddit's r/science

Overview

Updated 2 hours ago

Scotty, the largest Tyrannosaurus rex skeleton on record, died 66 million years ago with a broken rib that was still healing. The rib holds a dense network of mineralized blood vessels that formed as the dinosaur's body worked to repair the fracture.

The find is the first high-resolution 3D look at dinosaur healing blood vessels. It also points paleontologists toward a new hunting ground for soft tissue that survives deep time: broken bones.

Why it matters

Broken bones trigger a surge of blood vessels during healing, and those vessels may fossilize where normal ones don't. Paleontologists gain a new soft-tissue target.

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Key Indicators

66M
Years since Scotty died
The rib preserves a healing Late Cretaceous fracture, roughly 66 million years old.
8.87
Estimated body mass of Scotty
The 2019 study that crowned Scotty the largest T. rex on record.
2
Mineral layers in vessel casts
Pyrite partially oxidized to goethite or hematite, laid down in two distinct layers.
Months
Between rib fracture and death
Scotty died before the fracture finished healing, which let the vessels fossilize.

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People Involved

Organizations Involved

Timeline

August 1991 September 2026

8 events Latest: Today
Tap a bar to jump to that date
  1. Discovery tops Reddit's r/science

    Today Media

    The IFLScience report on the blood vessels reached the top of r/science, bringing the find to a mass audience.

  2. NY Post covers Scotty's healing wound

    Media

    Wider coverage framed the rib as evidence of how the apex predator died in a Canadian salt marsh.

  3. Blood vessel finding reported to the public

    Media

    ScienceDaily and other outlets detailed the discovery of iron-rich vessels in the healed rib.

  4. Neutron imaging at Oak Ridge National Laboratory

    Research

    The team used the MARS and VENUS instruments to verify the synchrotron findings nondestructively.

  5. Paper describes mineralized vessel casts

    Publication

    Scientific Reports published the team's synchrotron analysis showing the vessels are casts of pyrite oxidized to goethite and hematite.

  6. Mitchell flags preserved tissue in Scotty's rib

    Discovery

    University of Regina student Jerit Mitchell spotted vessel-like structures in the rib using micro-CT scans.

  7. Scotty confirmed as largest T. rex on record

    Research

    A study in The Anatomical Record estimated Scotty's mass at roughly 8.87 tonnes, above all other known T. rex specimens.

  8. Scotty's skeleton discovered in Saskatchewan

    Discovery

    Amateur paleontologist Robert Gebhardt found the T. rex skeleton in the Frenchman Formation near Eastend. Excavation took years.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

March 2005

Mary Schweitzer's B-rex soft tissue (2005)

Paleontologist Mary Schweitzer reported flexible, translucent vessels and cell-like structures inside a 68-million-year-old Tyrannosaurus rex femur known as MOR 1125. The find challenged the assumption that soft tissue cannot survive tens of millions of years.

Then

The claim drew intense skepticism and replication attempts, with some labs unable to reproduce the results.

Now

It opened a research field hunting for molecular and cellular remnants in dinosaur bone, and it remains contested today.

Why this matters now

Scotty's rib vessels are the same kind of claim, extended to healing structures. The current team's careful chemical work responds directly to the criticisms Schweitzer faced.

July 2008

The biofilm interpretation challenge (2008)

Thomas Kaye and colleagues argued in PLoS ONE that the "soft tissue" in Schweitzer's dinosaur bones was bacterial biofilm, not original vessels or cells. They presented scanning electron microscope images of slime-like structures on both modern and fossil bone.

Then

The debate split the field, with supporters on both sides publishing follow-up evidence.

Now

The episode set a standard: soft tissue claims now require chemical and structural evidence, not just visual similarity.

Why this matters now

Scotty's team preempted this critique by chemically mapping the vessel casts' pyrite and iron oxide composition and tying their shape to the fracture callus.

Sources

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