In some previous posts I have discussed how aggressive the red-winged blackbirds can be towards the great blue herons.  The herons are quite happy to eat the chicks of the blackbirds, so the aggression is justified.  One of the herons was flying in my direction when a blackbird swooped down at it.  It came in from above and behind and started to attack the heron.  I got a sequence of shots as this evolved and my favorite is one where it actually looks like the blackbird is riding the heron.  If only it had some reins!