This is a female blackbird in our garden, collecting moss from our lawn. This has caused many a debate in our household - on one hand, she's removing the moss which might mean the grass can grow in its place, on the other hand, holes in the lawn! And she often dips in the water to wet it - making the water pot all muddy!
Personally, I love when she does this, even with the mess and the holes. It hopefully means baby blackbirds!