Lunch in the Park

We are having some beautiful fall weather here in Tennessee. The other day I packed my lunch and spent my lunch break in a quiet secluded spot on the Greenbelt near where I work. I found a bench to sit on and sat near a pond. I could hear the trees rustling in the wind, the cars on the road off in the distance and an occassional siren. I also kept hearing a sound that was unfamiliar to me. It knew it wasn't a bird or an insect sound. It was a dull clucking sound and stopped when I got up to look for it. Then it would start up again a few minutes later when I sat down. I'm thinking it might have been some ducks or geese. I'll have to bring someone with me next time to help me figure it out!