sentences:  The nominate subspecies, "P. e. exarhatus", occurs in north Sulawesi, and "P. e. sanfordi" is found in central, east and south Sulawesi, Buton and Muna Island.The Sulawesi hornbill is a social species that lives in groups of up to 20 individuals.It is believed that only the dominant pair breeds, while the remaining members of the group act as helpers.