That last one reminded me of something. Before I moved I used to have chooks (chickens) and one day I was collecting eggs and cleaning up the pen and left a couple of eggs outside on a stump.
A crow came out of nowhere, took one egg and flew up to the big gum next door and put it in a fork. I raced out and grabbed the other one and went back in. He flew down to get it and it wasn't there, couldn't see me. He looked everywhere for that egg.