Overview
- Researchers analyzed 17 specimens, largely from Montana and North Dakota museum collections, to construct a revised growth curve.
- The team used thin-section histology, four ring-counting methods, and statistical modeling to address closely spaced growth marks.
- Findings indicate a rapid adolescent growth spurt from roughly ages 14 to 29, with yearly gains of about 800 to 1,200 pounds.
- A subsequent subadult phase lasting 10 to 15 years points to prolonged, slower growth that likely altered ecological roles over time.
- Authors report that standard ageing protocols may need revision and note taxonomic uncertainty within a possible T. rex species complex, including outliers such as “Jane” and “Petey.”