When the family goes up to the river, they take the dogs with them. This is a mistake because when they see a herd of buffaloes, the dogs start barking. The boys have to shoot down one of the buffaloes because the family are at risk of being attacked.
They catch you young buffaloes. This is good because the buffaloes will give them milk and pull the plough. The number of animals(pigs, dogs and chicks) grows and the donkey mates a wild donkey. Now the family need more food for all these animals.
In winter, life on the island is very difficult. The rain never stops and the family are always wet. The treehouse they built is no longer as comfortable as before and there is little food left so they have to kill a few of their animals. The family have a very bad time.