Brahmin
From FOnline: 2238 Wiki
The resulting radiation from The Great War caused cows to mutate into the two-headed Brahmin. They are very common across the wasteland and are bred for their meat, hides and carrying ability.
Brahmin can be found in pens in most major cities. The brahmin herder near the pen will offer to pay you for shit shoveling as well as buying and selling brahmin.
Using a rope, brahmin can be captured similar to the way slaves can be taken except that you do not need to knock brahmin unconscious to capture them. They can then be sold to traders or kept as companions.
They are most used for their high carry weight, especially when mining because these materials are extremely heavy.