Fudo wrote:
Vid no worky for mobiles.. But at least she lives again.
It's a shame you can't watch the video. It's good, basically it describes and plays the reconstruction of a Parasaurolophus call, and mentions how the air travelled through the inner tubes in the head crest, and the resulting resonance. It also says about how Parasaurolophi had a remarkable auditory cortex, and that they would have often used infrasound to communicate with other members of the herd (as to not attract predators - much more covert that way).
There is also evidence in Corythosaurus of very slender
stapes, which is a type of reptilian ear bone located in the middle ear, which along with a large space for the eardrum indicates a very highly sensitive sense of hearing. Corythosaurus, along with pretty much all hadrosaurs (which Parasaurolophus is a member of), have a similar head and ear structure, meaning Parasaurolophus would have at least the same hearing capabilities as Corythosaurus, although it's more likely it would have actually had an even more sensitive and complex hearing process as it had a larger auditory cortex. In fact Parasaurolophus had the largest brain of all herbivores, and it's EQ (brain size compared with body size) was the highest of all the hadrosaurs.
In other words, Parasaurolophus was a reasonably intelligent animal with a quite advanced method of communication. As each crest for each Parasaurolophus was different, and the inner tubes differed too (some would compare this to the same sort of differences found with fingerprints or snowflakes - no two are the same), each Para had it's own distict "accent" which distinguished it from any other Parasaurolophus, so herd members would know exactly who they are talking to from many miles away without even having to see their friend.
Infrasound could also have been used as a deterrent to predators if the need arose. When multiple Paras grouped together, the sound from so many low frequencies would have given the predator an uneasy feeling, perhaps even a feeling of nausia, just like how some people feel sick when experiencing loud low bass sounds with music. Not exactly the
"brown sound", but close enough.
Anyway, paras are immense.
Here's some more info if you want it:
http://en.wikipedia.org/wiki/Parasaurolophus
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THINGS I LIKE
Parasaurolophus, Plesiosaurs, Dinosaurs, Pterosaurs, Music, Tuna, Chocolate milk, Oreos, Blue things
Parasaurolophuscolobus. Parasaurcolobus. Colobusaurolophus.
....And Nunchucks are my friends.