Photo: Big Dinosaurs Heard Only Low-Pitch Sounds, Experts Suggest

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A visitor tries to "feed" a robotic Brachiosaurus at the temporary Jurassic Park Institute Tour in Tokyo, Japan, on July 22, 2003.

A new theory based on studies of birds' hearing suggests that large dinosaurs such as the Brachiosaurus could hear only low-pitched noises—meaning their hearing range would not include sound frequencies to which the human ear is optimally attuned.

Photograph by Koji Sasahara/AP

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