Buzzard visit

The three big chicks were in the nest when an adult sitting in a branch close by began alarm calling, the smaller two chicks instantly lay flat in the nest and shielded their fish. One of the chicks boldly sat at the edge of the nest to survey any drama, the adult male was seen to take off and all the chicks sat back up into a more relaxed position.
A short while later a buzzard was heard flying around the nest and calling loudly, the chicks did not flatten back down and the adult returned. There was no alarm call and the buzzard sounded very close by but did not seem to be perceived as a threat.