What idioms are there about animals, fables and cooperation?

At first, as long as one sheep is willing to cooperate. According to the book, two lambs met in the middle of a wooden bridge where only one person could walk. After thinking, if they don't give in to each other, they only see their immediate interests. However, they only see their immediate interests, which are indispensable in social life. Unity and cooperation are not just the way to solve problems. Both sheep can cross the river. They cooperate with each other to eat grass on one side, and then another pile of grass. Finally, there is no grass to eat. They refused to give way to each other and finally fell into the river together, but the rope was not long enough. "Two donkeys are eating grass" depicts two donkeys dying of "hunger". There is a pile of grass on each side of them, and no one can eat grass. They do the opposite, eat their own grass and have no spirit of unity and cooperation. They can see the interests of * * * and cooperate, which is a moral quality. It embodies people's wisdom. I heard the fable of goats crossing the river when I was very young. The two donkeys couldn't finish the pile of grass in their respective directions and were tied by a rope.