Re: How would Tyrannosaurus approach a Triceratops?

[Michael Mortimer <mickey_mortimer111@msn.com>]

Jaime A. Headden wrote-

>   Note that tyrannosaurs are not really well known for their scleral 
> rings,
> such that, unlike birds, their eyes were free from these physical 
> constraints.

Tyrannosaurids did have sclerotic rings.  Here's what Hurum and Sabath have 
to say about Tarbosaurus-

"The sclerotic ring is only preserved in a subadult specimen with the skull 
length of about 0.8 metre,
GIN 100/70. Here the sclerotic ring has an external diameter of about 
65mmand internal diameter of 30 mm. It consists of 15 plates. The sclerotic 
ring is still relatively large in this juvenile individual, and the orbit is 
almost oval. The ?keyhole shape? of the orbit in adults defines the space 
for the eye at the upper end. The eye in juveniles would also occupy 
proportionally more of the orbit."

Mickey Mortimer