Generally it is pretty quiet as they all mill about from bucket to trough checking if there is some food left the others missed. They can get a bit fractious though when there is only one bucket left and they all want to get at it.
I work on giving them about 3 feet of head space per animal plus a bit more. This seems to avoid squabbles and means that the more retiring members of the group get a chance to see the food too.
The female front right is due to give birth soon and is wearing a marker made out of ribbon and a weight from a helium balloon so I can pick her out in the field at a distance. Note – I did not leave the helium balloon attached but maybe that would have been an idea!