The Hebrew term tachash of Exodus 25:5 is considered by some translators to be a reference to blue processed skins. Other scholars dispute this and claim instead that the term should be viewed as a reference to either an ermine or an antelope or an okape or a giraffe or a dugong or a narwhal. The above term appears in a text which notes the various types of offerings that the congregation are to bring to the tabernacle.
The ermine is a colour changing member of the mustelid family.
Habitat: Europe, North America and Asia.