Exodus 35:7

ram skins dyed red and fine leather; acacia wood;

Note Possibly the hides of large aquatic mammals; also in verse 23

And rams’ skins dyed red, and badgers’ skins, and shittim wood,

rams’ skins dyed red, sea cow hides, acacia wood,

and rams’ skins dyed red, and sealskins, and acacia wood,