Bringing extinct animals back to scientific life.

Every reconstruction is measured, so a genus like Diplodocus can be compared specimen against specimen — here its two species and their specimens, with a 1.8 m human for scale.

The best-known Tyrannosaurus rex specimens — Sue, Stan, Scotty and more — drawn to one scale with a 1.8 m human. They differ by only a few percent, but every difference is real.

One species at two life stages: subadult “Big Al” (MOR 693) beside juvenile “Little Al”, drawn to a common scale with a 1.8 m human.

Two specimens of the crow-sized “first bird” Archaeopteryx — the Thermopolis and Chicago individuals — at a common scale, measured in centimeters.