Squirrel
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| Other names: | Blue Chinchilla |
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| Genetics: | Agouti with two copies of the blue gene, plus chinchilla spotting and modifiers. The exact genetics behind chinchillation is unknown, though it appears to be one major spotting gene and one major modifier to remove the yellow pigment from the colour (some American breeders have suggested "S" for the semi-dominant spotting gene and "fy" for the recessive fading modifier, giving a chinchilla the genotype A-ddfyfySs). Rats who have the spotting gene but are not expressing the fading gene appear to be cold blue agoutis, with not quite the amount of yellow they would otherwise have. |
| Description: | Top colour silver blue, caused by the intermingling of blue guard hairs over a pearl white ground. Undercolour slate blue, intermediate portion pearl, tips blue. Underside to be white with a clear demarcation between top colour and belly. |
| Status: | This colour is partially standardised in UK rat clubs with the name Squirrel |