Tyrannosaurus rex

[johnny rex]

Some bird species have males which are the larger and dominant morph @brotherbear, while others such as most birds of prey and some ratites (flightless birds) have reverse sexual size dimorphism (size differences between males and females) in which the females are larger than males and more dominant than the smaller males. 

Not really @chaos, finding gender by just looking at fossils is actually nearly impossible. So far, only one specimen of Tyrannosaurus have been assumed as female called as MOR 1125 or B-rex because there is a medullary tissue found in its femur. It is known that only female birds have this kind of tissue especially when the female bird is about to lays eggs, so this Tyrannosaurus specimen is assumed to be female if what was found in its femur is indeed 100% similar to bird medullary tissue. Reply