I saw a bird high in an oak tree in our yard. It was exhibiting very warbler type behaviour. Flitting from branch to branch, leaf to leaf, very quick, never stopping. I couldn't make out what it was. It looked different from any warbler I ever saw before. I was really excited maybe this was going to be a lifer! Finally it stopped and dug out a juicy caterpillar and I got a shot of it. Still didn't know what it was till I looked at it on the computer later. Turns out it was a Chipping Sparrow. He sure fooled me!