Well, today we warmed up in Texas from the cold. My pond went from 44 to 51 degrees with the air temp in the upper 70's. I was glad to see my fish swimming around and visiting the top again. Then when I came home and fliped on the outdoor lights I see a Heron standing on my skimmer box and the box is wet. The bird took off and I grabbed my flashlight to see if they are all gone. I can only see my smaller 3 koi at the bottom. My larger, friendlier 2 koi are MIA. I am so pissed right now.:twisted: I had most of the pond covered with a leaf guard too. I was really surprised that this would happen in the end of December. I see these birds all the time during the Summer but not now... or so I thought. I will keep you posted if they show up in the morning. Maybe they are just hidding after having the s#!t scared out of them.