My hammy is changing colour....

[Fluffagrams]

I have a pure Winter White and he began to change into a winter coat in the middle of December but it wasn't a proper white... he just went this weird light grey colour. He's now back to his normal sapphire colour apart from a few patches that remained white. It was interesting to see his colour change although a bit frustrating as winter coats are penalised in shows.

Apparently even pure winter whites will change more than others even if they are kept in exactly the same circumstances which makes me think the amount of change could be genetic.