T. rex sex determined by bones

[bh480@scn.org]

From: Ben Creisler bh480@scn.org

In case this item has not been mentioned yet:
http://www.ncsu.edu/news/press_releases/05_06/133.htm

and from Science:

?Gender-specific Reproductive Tissue in Ratites and 
Tyrannosaurus Rex?
Authors: Mary H. Schweitzer and Jennifer L. Wittmeyer, 
North Carolina State University; John R. Horner, Montana 
State University
Published: June 2, 2005, in Science
Abstract: Unambiguous indicators of gender in dinosaurs 
are usually lost during fossilization along with other 
aspects of soft tissue anatomy. We report the presence of 
endosteally derived bone tissues lining the interior 
marrow cavities of portions of Tyrannosaurus rex (MOR 
1125) hindlimb elements, and hypothesize that these 
tissues are homologous to specialized avian tissues known 
as medullary bone. Because medullary bone is unique to 
female birds, its discovery in extinct dinosaurs 
solidifies the link between dinosaurs and birds, suggests 
similar reproductive strategies, and provides an 
objective means of gender differentiation in dinosaurs.