Why the wire fence on the top?

One word: RACCOON

Not only was the frog staying in the pond, there were some gold fish in there too, that's why I needed to have some kind of protection to prevent raccoons from jumping in...

Unfortunately, fish is just too tempting to raccoons, even the fence cannot stop them from coming to look for sashimi...

One morning, I found the fence dropped down close to the water and the filter was totally messed up... I suspected it was the raccoon(s) that came to look for food last night. Anyway, I got the pond fixed.

When I came home after work at night, I went out to the backyard and caught some fresh air. As I turned around, I saw ten eyes starring at me... OMG, a family of five (two big ones and three small ones) were standing just about 5 ft. away. It was the closest encounter I've ever run into. Fearing these guys may carry rabies and jumped on me, I had a thought to rush into the breezeway, but instead, I grabbed a lawn chair next to me and chased them away. Whew!