Seacows were creatures living during the New Age. Dwarves were fond of taking seacow horns and using them to adorn their own helmets, as was the case with one Dwarf sentry that "Four" Wheeler and Mirabel Miller encountered while infiltrating the Giant war machine in 3891.
Behind the Scenes[]
In real life, manatees are also sometimes called sea cows, but they do not have horns to speak of.