This strange grey colour is actually due to the formation of a "fever coat", a pigmentation of the kitten's hair that occurs when her mother suffered from an intense fever during pregnancy. In a few weeks, the kitten's silver coat will completely disappear to make room for its final, black colour.
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In the meantime, little Rizzo is growing well and will soon be offered up for adoption!
Check out the video above to see this little kitten's transformation...
