TheropodaAllosauridaeMOR 693

Allosaurus jimmadseni

“Big Al” · MOR 693

Allosaurus jimmadseni skeletal reconstruction, left lateral view — the subadult MOR 693 (Big Al), ~6.6 m.
Scale bar = 1 meter
Taxon
Allosaurus jimmadseni Chure & Loewen, 2020
Specimen
MOR 693
Repository
Museum of the Rockies
Reconstructed length
~6.9 m (23 feet)
Completeness
~95%
View
Left lateral
Basis
Subadult individual; one of the most complete allosaurs ever found
Drawing
© Scott Hartman
Drawn
1997, revised 2026

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MOR 693, also known as “Big Al,” is a strikingly complete subadult Allosaurus jimmadseni from the Morrison Formation of Wyoming. The specimen is famous both for how much of the skeleton was recovered and for the many healed injuries and pathologies its bones record. It doesn’t hurt that the BBC also made it the star of a Walking With Dinosaurs documentary (The Ballad of Big Al) in 2000. In a twist of irony, despite the nickname Big Al was not yet fully grown.

The evidence

What MOR 693 actually preserves

Known-material diagram of Allosaurus jimmadseni MOR 693 (Big Al) — preserved elements shown in white against a black body silhouette.
Known material of MOR 693: elements preserved in the specimen are shown in white; unpreserved regions are left as black silhouette. Drawn 1997, revised 2026

Other Allosaurus jimmadseni specimens

Allosaurus jimmadseni skeletal reconstruction, left lateral view — the juvenile 'Little Al', ~2.8 m.
Privately held
“Little Al”

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