Sealskin
International Standard Bible Encyclopedia · James Orr and contributors
sel'-skin: The rendering of the Revised Version (British and American) (Ex 25:5; Eze 16:10) for `or tachash, the Revised Version margin "porpoise-skin," the King James Version "badgers' skin." A seal, Monachus albiventer, is found in the Mediterranean, though not in the Red Sea, but it is likely that tachash means the dugong, which is found in the Red Sea.
Source of the article
International Standard Bible Encyclopedia — James Orr, general editor and contributors; CrossWire SWORD module ISBE 2.2
Bible Strong digital edition from CrossWire module 2.2; historical scholarship originally published in 1915