Re: Briefing Document: The British National Identity Scheme


"abelard" <abelard3@xxxxxxxxxxx> wrote in message
news:i6a3139vfs1tbm605uakg759hjvmglj392@xxxxxxxxxx
<snip>
http://www.post-gazette.com/pg/06256/721190-114.stm
"....birds, amphibians and reptiles have been for eons."
[i can't remember if this was 'all' of those groups]

Those creatures have long had four-color vision, but a key difference
is that their fourth type of color detector is in the high-frequency
ultraviolet range, beyond where humans can see.

In fact, that finding allowed scientists to figure out recently why
the males of some species of birds did not appear to have brighter
plumage than the females, Dr. Neitz said.

The problem was in the observers, not the birds, he said. When those
species were viewed through ultraviolet detectors, the males had
markedly different feathers than the females."

That's interesting, thanks.

I suppose an analogy is the zebra. People think, how can black-and-white
stripes be advantageous in grassland?

The problem is in the observer. People see in colour - lions see in black
and white.



.

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