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Blue dun (grulla).

Icelandic: Mósóttur, móálóttur.
Description: The horse has a blueish, steel-grey or silver-greyish body colour. The feet are dark, and a blue dun has an eel (stripe) going along it's spine, from the ears back to the tip of the tail. On a dark blue dun the mane and tail are mostly black, but on a lighter blue dun the edges of the mane and tail are also blue dun or creme-colored. On such a horse the stripe can be seen clearly in the mane, where the edges are lighter and the middle of the mane is black. The ears are usually with lighter hairs inside them, and black edges. Many duns have darker stripes on the upper legs, and many duns have a smutty head.

Light blue dun.
Very often the stripe can be seen going very clearly through the middle of the mane and tail, while the edges of the mane and tail have the lighter body color.
Mósa from Ysta-Mói.
C: Lukka.

A light blue dun.
This horse has clear light edges on the tail, and a black middle in the tail.
He shows clear stripes on the legs, and has a smutty face.
A very clear example of the blue dun color.
C: Lukka.

Dark blue dun tolting.
On this horse there are very unclear lighter edges of the mane and tail.
This horse has virtually a black mane and tail, with just a few lighter hairs.
Bjössi on Flosi from Frostastöðum on Landsmót 1990.
C: Lukka.

Dark blue dun, again with mostly black mane and tail.
Galsi from Sauðárkrókur doing the flying pace.

See how the inside of the ears is greyish, but there is a black line drawn on the edges of the ears, this is how the blue duns are. This blue dun is dark with a smutty head.
Our Flosi from Frostastöðum on a quiet day.
C: Lukka.

This blue dun is light, with a much lighter head and less prominent smuttyness.
Mósa from Ysta-Mói.
C: Lukka.

Here you can see the stripe (eel) on the back well.
Flosi from Frostastöðum.
C: Lukka.

Many duns have stripes on their legs.
C: Ómar Runólfsson.

Foal color:

The foal color on a blue dun is much lighter than when the horse is adult. Often people think their black foals are blue dun, as a black foal often has a color similar to a dark blue dun.

A one hour old blue dun foal with it's blue dun mother.
C: Linda Bergström.

The same foal is 2 months old here. It is still in a light foal coat, when it was grown up it's color was even darker than that of it's mother.
C: Linda Bergström.

A blue dun foal that later became an ordinary blue dun adult.

To be sure whether your foal is blue dun or black, remember that a foal can not be dun exept if it has a dun parent, and check on the pictures of black foals

Some genetics:

The blue dun colour is on the D-locus. A dominant D gene lightens up a black horse and changes it into blue dun.

The colour in different languages:

Norway: Grå, musegrå.
Denmark: Musegrå med ål.
USA: Blue dun, grullo, black dun.
UK: Blue dun, mouse dun.
Germany: Mausfalbe.
Dutch: Wildkleur zwart.
Swedish: Musblack.

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