'the bird whisperer'

I'm more of a people/street photographer but I came across this chap in the park yesterday.  Initially I wanted to know why the heron was staring at him, fixedly.   It soon became clear he was feeding them tinned fish. 




I wonder what those heron's are thinking. 'Is that yours or mine?' Or 'race to you it.'



They appear to change shape and size, depending on how they stand.