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Posted by: jacob crawford
Posted by: PheonixofLight
They didn't have vocal cords.
This. They made noise, but not like how Hollywood portrays it.
Not necessarily true. Vocal cords in the larynx is a trait that evolved independently in more than one lineage of animals. Birds have vocal cords, mammals have vocal cords, and scientists, examining the grooves and muscle placement of dinosaur bones, believe dinosaurs did all the same
This is an example of convergent evolution- similar traits evolving independently amongst distantly related organisms.
[Edited on 12.06.2012 4:11 PM PST]