Healthy fear of Ducks

I took Elli to the park today since it was so pretty. We went to Shawnee Park and played and she fed the ducks. She couldn't wait to see them and play with them. Then we saw the big geese. At first she was happy to see them too, but then, she realized they were not making happy "quacking" noises. They were hissing at her and then they started running toward us. Elli ran the other way and said, "They are chasing us mommy!" I had to explain that some ducks are not very nice. We need to play with the little ducks, not the big ones. On the way home she said, "The little ducks are nice, the big ones are mean."