This afternoon Daddy and I went out for a walk

This afternoon Daddy and I went out for a walk
One day Daddy and I went out for a walk.On the way we saw a lot of people.We went up and had a look.Oh dear!What did we see?There was a donkey (驴) in the middle of the road.It would not move.The cars and buses could not get past.
Then a policeman came.“Whose donkey is this?” he asked.“It's mine,” said a farmer,“but I can't move it.” The policeman and the farmer did their best to move the donkey,but it would not move.We laughed,but the drivers of cars and buses were worried.“We can't move the donkey,” the farmer and the policeman said.“What shall we do?”
“Give him a carrot!” my father said.
“That’s a good idea!” said the farmer.
Soon he found a carrot and showed it to the donkey.When the donkey saw the carrot,it jumped up and walked after the farmer.All the cars and buses could get past at last!
这段话说明了什么?驴看见鹦鹉怎么就jump了呢?