very bright colour do the change to the environment they are in?
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although they are most often orange the common starfish varies between brown and purple. I am not sure about the reason for the colour variation but it is likely to be as a result of genetic variation possibly to help in camouflage.
To find out about what's going on in the south west check out http://www.ispot.org.uk/forum/8409
Lat/Lng: 55.1, -1.6
OS grid ref: NZ3085