A clattering of jackdaws

Griff, the temporarily resident cat, caused mayhem today when he climbed to the top of a blocked up chimney. I knew something was amiss by the terrific noise the displaced jackdaws were making. They must have called in reinforcements from neighbouring colonies because there were at least two dozen of them trying to frighten Griff off by shrieking at him. They certainly merit their collective noun of a "clattering".

Griff just turned his back on them and surveyed his kingdom.