Cattle

 are creatures found in the pens in the Fields inside the Twin Mothers village.

Characteristics
They are friendly and unirradiated, so, unlike the two-headed brahmin, they resemble the cows we see today. They are found in the pens in the Fields and are owned by the Twin Mothers.

Appearances
were to appear in Van Buren, the canceled Fallout 3 by Black Isle Studios.