Just like Mink, it is unknown exactly when Blue Mink cropped up, but it would have been anytime after 1975 when all 4 colours were known. Blue mink has a brown that is darker than Mink and has a slight Purple-blue tinge over its coat. [1][2]
Blue Mink |
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References
[1] Logsdail, C., Logsdail, P. and Hovers, K. (2007). Hamsterlopaedia. Surrey [England]: Ringpress, p.135.
[2] National Hamster Council Information Leaflet No. 45 (2008)
[2] National Hamster Council Information Leaflet No. 45 (2008)