After finding lots of bird poo blobs in and around my pond I finally witnessed the culprit. We have common grackles around here and I seem to have a nesting pair. I have now seen this bird on half a dozen occasions fly to the pond with a blob of bird poo in its beak and deposit in my pond! Sometimes he just flys over and drops it in the pond and other times lands on the edge of the pond and drops it in or on the rocks around the edge. We are talking 1/2 inch to 3/4 inch diameter blobs of poo. How strange!!!! After reading up on this it seems it is common practice for grackles to deposit their youngs poo in bodies of water, swimming pools etc. The only good thing is the poo does not disintegrate when its in the water, so I can scoop it out. But it is making a mess when its on the rocks and drys there. 
Nothing I can do I guess but keep scooping it out. Hope they dont have their next brood around here!!!
I know they are just doing their natural behavior but its getting very annoying. Just waiting for it to land on me while i'm out there working on the pond!
Nothing I can do I guess but keep scooping it out. Hope they dont have their next brood around here!!!
I know they are just doing their natural behavior but its getting very annoying. Just waiting for it to land on me while i'm out there working on the pond!