This is a picture I took of my friends 8 weeks old black ferret.
She has grown up today and looks like this.
Copywright Ann Hillerslev
and it is a ferret.
As Flying Ferrets aka Anne says they are becoming more and more common in Europe, espicially Germany, Austria, but are also seen now in DK, Norway, Finland, Sweden and so on. Because people travel to Germany/Austria to get them.
They are traced to one man, Peter Herzoghof, and some think the color origins from hybrids between wild european mink and ferrets.