Do Animals Need Huge Brains?

Do animals need to understand another animal's thoughts and feelings to be able to behave co operatively? Ias, just say, it's just such a fascinating ar, you know. It is naturally a of us as humans to look at other animals and compare them to us,. And and we are animals, so they're s absolutely realan behind thatno, absolutely, absolutelynd, tis, it t is just fascinating. But i also think it's important to remember that intelligence isn't the only, or necessaryl the most important thing that animals have evolved right? Right?