Fwd: Re: How would Tyrannosaurus approach a Triceratops?

[Aidan Karley <aidan_karley@yahoo.co.uk>]

(forgot to send this to the list, instead of just to Neal)

--- Neal Romanek <nromanek@earthlink.net> wrote:

> T-Rexes did have binocular vision however, yes?
> 
    I'm not sure, and being back at sea with a slow internet
connection, I hesitate to try to find out. I recall having heard it
mentioned, but I'm by no means certain. Thinking about it, wouldn't
the snout have got in the way of most directions of binocular vision?
With the head down and charging at Lunchospikysaurus (gen. nov. but
short-lived <G>) then the zone of vision above the snout line would
have included the target and been potentially in stereo. I'm not so
sure when T-rex is staring down his nose at L. though.

> On Aug 18, 2005, at 3:45 AM, Aidan Karley wrote:
> 
> > Elevation of the head is OK, but the evidence for "superior
> > eyesight" in T-rexes (over ceratopsians) is?
> 
> 
   I was thinking in terms of visual acuity, possibly colour
sensitivity too, rather than binocular capability. Is the improved
depth perception that may go with a stereoscopic overlap "superior"
to the 300deg + field of vision given by having your eyes mounted on
either side of the head? I'd agree they're different, but I'm not
sure they're sufficiently comparable to say one is "better" than the
other. 
    Some birds at least have colour vision - need it to recognise the
mate's plumage - which returns to the previous question of if this
would leave identifiable evidence on brain casts?


-- 
Aidan Karley,
Aberdeen,
Scotland


-- 
Aidan Karley,
Aberdeen,
Scotland


                
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