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Screams on deaf dino ears.

IF Tyrannosaurus Rex was alive today it would not be able to hear you scream, say scientists.

Large dinosaurs had limited hearing and could not pick up high pitched sounds, a study has found.

T Rex would have been deaf to human screams, according to Otto Gleich, from the University of Regensburg, in Germany.

His team used data from studying birds to calculate the frequency range of dinosaur hearing, New Scientist magazine reported.

Hearing range decreases in birds with increasing body mass and the length of a key structure in the inner ear.

Dr Gleich measured the length of the cochlear duct in the prehistoric bird Archaeopteryx and two dinosaurs, flesh-eating Allosaurus and the giant herbivore Brachiosaurus.

He calculated that the hearing of Archaeopteryx would have been in the range of modern birds.

A 1.4 tonne Allosaurus would have heard best at a frequency of 1.1 kilohertz, with a cut-off at 3 kilohertz - the pitch of a human scream.
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Publication:Birmingham Mail (England)
Date:Jan 6, 2006
Words:161
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