Collective nouns

This afternoon, with what might be classed by some as reckless abandon, I have collected five extra children. There is now a tribe of seven running around the garden, driving tractors and trikes, watering plants, digging in the sandpit and generally getting up to all sorts of mischief. All this activity is accompanied by a constant babble of noise, most of it loud. I can only hope the neighbours are away.

I do no know what the collective noun for children is, but I would suggest a cacophony.