This is the contribution which you are to raise from them: gold, silver and bronze, blue, purple and scarlet material, fine linen, goat hair, rams’ skins dyed red, porpoise skins, acacia wood,
Exodus 25:3-5 NASB
Porpoise skins?
por'-pus (the Revised Version margin has "porpoise-skin" for `or tachash, the Revised Version (British and American) "sealskin," the King James Version "badgers' skins" (Exodus 25:5; 26:14; 35:7,23; 36:19; 39:34; Numbers 4:6,8,10,11,12,14,25; Ezekiel 16:10)):
(for shoes in Ezekiel 16:10).
The word here seems to be tachash, which is some kind of a mystery animal. I read an article that said it was quite possibly a one horned beast large enough that the covering was from only one animal. So there are many speculations as to what this could be from the King James badger too the Babylonian Torah's unicorn.