We know that 1 rabbit is going to the river and 2 monkeys and 2 parrots are also going. However, it never mentions that the 6 elephants are going to the river. It says that the rabbit saw the elephants while going to the river and the monkeys holding parrots who were going to the river as well. You can argue that only 5 animals aregoing to the river since that is what it technically says in the math problem.