Large group auto-sort (LGAS) systems require considerably more effort on the pigs’ part to access feed than in small pens. We studied the pigs’ behaviour in two LGAS systems to determine what adaptations they made. Pigs were able to maintain their typical diurnal eating pattern, with peaks at ‘lights-on and lights-off’ as seen in small pens. However, the pigs modified their eating by having fewer (5 vs 10-15) but longer meals than in small pens. Pigs made use of all of the available feeder spaces within the food court, visiting several each day. Although able to adapt their eating behaviour to the large group system, some had difficulty learning to enter and leave the food court several times a day. Management should ensure an adequate number of feeder spaces, sufficient room to move in the food court, and training methods to facilitate use of the auto-sort scale.