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Re: Eagle eyes
David Krentz wrote:
Perhaps palpebrals reduced glare from the sun, sort of a sun visor to
animal from being sun-blind while grazing etc. Maybe for raptors it aided
focusing on prey down on the ground below.
This same idea came up on the List a couple years ago ('98, I think) in a
thread I had entitled "Theropod Sunglasses?" I had suggested that maybe the
theropod brow ridges and hornlets were useful for shielding the eyes from
the sun. During that discussion, someone (sorry, I forget who) brought up
the idea that some ornithischians posessed palpebrals that may have served
the same purpose. It may be helpful to search the archives for information
on this subject. Personally, I think it's an interesting propostion as many
birds (as has already been mentioned) and even the sidewinder snake use
these adaptions to cut down on glare from the sun.
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