The Cormorant and the Crow

A cormorant has been seen several times in Saughton Park in recent months, although I've never seen it myself (like the kingfisher!), but today I came across it in the river at Roseburn Park. A crow was taking great exception to it being there for some reason though! They were both shouting at each other and the crow kept flying around and flapping at the cormorant. Not sure what it had done to upset it!