According to BBC Future, another unlikely sound piercing through the trees back when dinosaurs ruled the earth was chirping, the kind we now associate with birds and crocodiles. Based again on the length of the cochlea, it appears dinosaur parents were sensitive to high-pitched sounds, which they likely used to locate their babies. “Given that baby birds and baby crocodiles chirp, it’s reasonable to infer that baby non-bird dinosaurs did as well, and that their parents listened to them and cared for them just as crocodile and bird parents do,” explained Bhart-Anjan Bhullar of the Peabody Museum of Natural History.
As these sounds of Jurassic forests come to life, they paint a seemingly more accurate picture, but it’s still not entirely reliable. For all the fossils we have found, one essential key to dinosaur sounds is missing — a syrinx. It is the voice box of modern-day songbirds, and unlike the larynx, which is located in the windpipe, the syrinx sits right next to the heart to produce the unmistakable chirps and whistles we hear from birds (via the University of Texas at Austin).
No syrinx has ever been found in a dinosaur fossil, and many scientists believe that it didn’t exist (per the University of Texas at Austin).