The herons at Juanita Bay are not universally popular.  The red-winged blackbirds are not keen on them at all and, since it seems that the herons may have raided one or more of the nests, it isn’t hard to see why.  The blackbirds will get quite aggressive at trying to drive the herons away from their nests.  I have seen them do this on more than one occasion.  At one point, I got some video of a heron getting attacked by two of the blackbirds although it wasn’t keen on leaving its fishing spot.  Usually, though, the herons decide to move on rather than take the abuse.