Why did some dinosaurs “sing”

Hadrosaur’s head is very special, like a musical instrument. Its horn and crown are hollow, similar to a bass Scottish wind seedling. Many scientists believe that by vibrating its nasal cavity, hadrosaur may make a low voice similar to a horn to attract the opposite sex and call its companions.
What color are dinosaurs?
None of us knows what color dinosaurs are. Although dinosaur skin fossils have been found, there is no color in them, only scales on them.

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