One Tiny With two Giants

There had been three cormorants but one flew. On the same island were crows , a heron , ducks and turtles .Another trip here tomorrow .Just minutes from where I live I consider myself lucky .22°c today and on leaving my place something told me it would be good .A yellow butterfly danced twice across my path followed by a peacock butterfly and a wasp . Cost me nothing and had the time of my life ..Who can say with certainty what the tiny black & white bird is .?