T-rex wouldn't hear you scream


	T-rex wouldn't hear you scream

onleyone

11-25-2007 6:56 PM

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tags:

dinosaur, bird, fossil, hearing, t-rex, t. rex, t rex, tyrannosaurus, tyrannosaur, rex, scream

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://www.clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/5d00884c-35a7-4b00-bdb1-a2c556d19771/B9B3EE78-DF09-47C5-81FA-8556E42D0515/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.newscientist.com/channel/life/dinosaurs/mg18925334.600-it-rexi-would-not-have-heard-human-screams.html" href="http://www.newscientist.com/channel/life/dinosaurs/mg18925334.600-it-rexi-would-not-have-heard-human-screams.html" style="font-size: 11px;">www.newscientist.com</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.newscientist.com/channel/life/dinosaurs/mg18925334.600-it-rexi-would-not-have-heard-human-screams.html"><P>The range of frequencies birds hear decreases with increasing body mass and increasing length of a key structure in the inner ear called the basilar papilla. Fossils don't preserve this, so Gleich measured the cochlear duct, which is typically a third longer and is preserved in archaeopteryx, allosaurus and brachiosaurus.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.newscientist.com/channel/life/dinosaurs/mg18925334.600-it-rexi-would-not-have-heard-human-screams.html"><P>He calculates that the hearing of archaeopteryx would have been within the range of modern birds, while a 1.4-tonne allosaurus would have heard best at 1.1 kilohertz, with a cut-off at 3 kHz - the pitch of a human scream. A 75-tonne brachiosaur would have heard best at 700 Hz, and been deaf above 2.4 kHz. The hearing of <I>T. rex</I> would likely have fallen between the two (<I>Naturwissenschaften</I>, vol 92, p 595).</P></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/B9B3EE78-DF09-47C5-81FA-8556E42D0515/blog/" title="blog or email this clip"><img src="http://content6.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>