Colours of Scotland (Animal Life)

Basically, on our trip to Scotland, the fauna we saw were sheep.  We didn't see deer or other ungulates (except stuffed and mounted, and then only their heads).  We saw sheep.  Furthermore, we saw white sheep.  Now, I'm not complaining.  A little fluffy white lamb melts my brain such that I'm reduced to a murmuring cutsie-talker faster than you can say jack rabbit (we saw some bunnies, too).  

It occurs to me that the sheep aren't only white, though.  They are painted with all kinds of wonderful bright spraypaint presumably for identification purposes.   If I were a bold designer, I might be tempted to make a sweater in all sorts of neon-on-natural combinations with a grass green background.  

I liked the colours of the birds.  Where I live, we don't have chaffinches, and I love the way they have blue heads.   Why aren't there blue mammals?  It's a great colour.