T-REX males used their tiny arms to grab their female dinosaur mates during sex, scientists now believe.
The way the bones connect in a newly found near-perfect skeleton proves that the vestigial limbs supported strong muscles.
It means the guns that have puzzled people for decades had a purpose and didn’t shrink because they were useless.
A team came to the conclusion after examining the fossil of Meraxes gigas, a new species that grew to 36 feet and weighed four tons.
Like T-Rex, it had a huge head. But it was also decorated with crests, bumps, furrows and small horns.
The experts say the two dinos can be compared as they were similarly shaped predators despite independently evolving into tiny arms.
The fossil was found in Patagonia, Argentina, and lived 90 million years ago – about 20 million before the evolution of Tyrannosaurus rex.
It showed complete regions of the skeleton never seen before, like arms and legs, and contains a lot of new information, according to the scientists.
project leader dr. Juan Canale said: “The skeleton shows large muscular insertions . . . So the arm had strong muscles. I am convinced that these proportionally tiny arms had a function.
“The harder question is what exactly were the features.
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“Sex and balance are the most likely.”
dr Canale, from the Ernesto Bachmann Paleontological Museum in Neuquen, Argentina, added: “They may have used the arms for reproductive behaviors, such as holding the female during mating or to right themselves after a fall.”
https://www.thesun.ie/tech/9065884/t-rex-tiny-arms-grip-dinosaur-during-sex/ T-Rex’s tiny arms were meant to “grab dinosaur dude” during prehistoric sex sessions.