Heron vs crow

A grey heron on the river Enz in Pforzheim repeatedly mobbed by a lone crow. Presumeably the heron had violated the crow's territory. Even after forcing the heron across to the opposite bank the crow continued its assault. Meanwhile the unruffled heron took it all in its stride with no intension of allowing the crow to spoilt its day. After several minutes the crow gave up, no doubt realising that annoying a heron that's much bigger with a seriously long sharp beak was maybe not such a good idea.