15 Facts About T rex

Teeth from what is documented as a Tyrannosaurus T rex were found in 1874 by Arthur Lakes near Golden, Colorado.

In 1998, Bucky Derflinger noticed a T rex toe exposed above ground, making Derflinger, who was 20 years old at the time, the youngest person to discover a Tyrannosaurus.

The neck of T rex formed a natural S-shaped curve like that of other theropods.

Specifically, the paper's T rex was distinguished by robust anatomy, a moderate ratio of femur length vs circumference, and the possession of a singular slender incisiform dentary tooth; T imperator was considered to be robust with a small femur length to circumference ratio and two of the slender teeth; and T regina was a gracile form with a high femur ratio and one of the slender teeth.

Identification of several specimens as juvenile T rex has allowed scientists to document ontogenetic changes in the species, estimate the lifespan, and determine how quickly the animals would have grown.

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One study suggests that the rarity of juvenile T rex fossils is due in part to low juvenile mortality rates; the animals were not dying in large numbers at these ages, and thus were not often fossilized.

Examination of B-T rex demonstrated the preservation of soft tissue within several bones.

When T rex was first discovered, the humerus was the only element of the forelimb known.

The biceps brachii muscle of an adult T rex was capable of lifting 199 kilograms by itself; other muscles such as the brachialis would work along with the biceps to make elbow flexion even more powerful.

Growth curves indicate that, as in mammals and birds, T rex growth was limited mostly to immature animals, rather than the indeterminate growth seen in most other vertebrates.

Research on the olfactory bulbs has shown that T rex had the most highly developed sense of smell of 21 sampled non-avian dinosaur species.

Specifically, data suggests that T rex heard best in the low-frequency range, and that low-frequency sounds were an important part of tyrannosaur behavior.

Currie's pack-hunting T rex hypothesis has been criticized for not having been peer-reviewed, but rather was discussed in a television interview and book called Dino Gangs.

The Currie theory for pack hunting by T rex is based mainly by analogy to a different species, Tarbosaurus bataar.

Since it was first described in 1905, T rex has become the most widely recognized dinosaur species in popular culture.