Cows are found in greenlands. They are neutral and will only become hostile if you attack them. They usually spawn in groups. Cows are generally good for low-level characters to fight, as they are easy to defeat and have a high xp yield.
They can be tamed using Liquid Drops.
The cow boss is a 1-Star boss with ~1800HP. It drops 17 G and can drop a 1-Star or 2-Star item.