Exodus 36:19

Additionally, he made for the tent a covering of ram skins dyed red, and over that a covering of fine leather.

Note Possibly the hides of large aquatic mammals

And he made a covering for the tent of rams’ skins dyed red, and a covering of badgers’ skins above that.

He made a covering for the tent of rams’ skins dyed red, and a covering of sea cow hides above.

And he made a covering for the tent of rams’ skins dyed red, and a covering of sealskins above.