The tiny arms have paleontologists scratching their heads.
"convinced that those proportionally tiny arms had some sort of function. The skeleton shows large muscle insertions and fully developed pectoral girdles, so the arm had strong muscles,” says Canale. That suggests the arms didn't reduce in size because they weren't needed. used the tiny arms to hunt because"actions related to predation were most likely performed by the head,” he says.
“Sexual selection is a powerful evolutionary force. But given that we cannot directly observe their behavior, it is impossible to be certain about this," he says.The specimens Canale and his team found were roughly 45 years old when it died. It was 36 feet long and probably weighed more than four tons. That's roughly what two r
hinoceroses weigh. The dinosaur appears to have lived during the time when carcharodontosauruses were thriving — but that wouldn't last for long. “The group flourished and reached a peak of diversity shortly before became extinct,” Canale says.The researchers discovered the specimen described in the paper on their first day in the field in 2012."It was probably one of the most exciting points of my career," Canale says.
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