Although the variety of supplies on Crow Island was quite limited, the abundance of ants meant there was plenty of food. After Noah captured 13 islands to raise chickens, the survivors no longer faced their greatest threat. Almost everyone who could land on the island was busy digging up ant nests to find ant eggs and larvae.
Of course, not everyone was able to land on the island; those who lacked the strength continued to gather seaweed. Despite occasional small-scale conflicts and disputes, it was a rare period of peace for the survivors, as everyone was able to have enough to eat during this time.
While other survivors were enthusiastically digging up ant nests, the Changsheng Adventure Group had its own affairs to attend to. Since the group had fewer people and more supplies, they didn't need to dig up ant nests and only gathered some as snacks.