Subject: Do some animals see only in black and white, or do all see a little colour?

Some refeences state that there are some colour blind animals - does this 
mean they see totally in black and white. Other sources say all animals 
have some colour receptors, its just that some have more than others.
Are there any totally black and white vision animals? If so, which?

The articles in the madsci archives (which I have already read) do
NOT answer the specifics of my question (put another way):

Are there some totally colour blind animals (i.e. that see no colour
whatsoever), or do even those with the poorest vision still see some colour?

This point is not addressed clearly in the two article.

Regards
Geoff Phillips

Response:

Re: Do some animals see only in black and white, or do all see a little colour?
Some refeences state that there are some colour blind animals - does this 
mean they see totally in black and white. Other sources say all animals 
have some colour receptors, its just that some have more than others.
Are there any totally black and white vision animals? If so, which?


_______________________________________________________________
Greetings - Your question was not submitted to the
MAD Scientist Network for the following reason:

A question similar to yours has been answered on our site.

Please look over these two related answers. Please feel free
to submit a question if you need additional information or clarification.

http://www.madsci.org/posts/archives/oct98/905228364.Zo.r.html
http://www.madsci.org/posts/archives/jul99/931925572.Gb.r.html


	Eric Maass, Admin MadSci Network

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Re: Do some animals see only in black and white, or do all see a little colour?