These large honeyeaters are found only in New Zealand. Though nectar is an important part of their diet, their food sources vary seasonally. They eat some large invertebrates during the breeding season and fruits in the fall. They often aggressively defend a good nectar source from their own and other species. Tui are important pollinators and seed dispersers of many New Zealand plants. Females build nests from sticks and grasses, incubate the eggs, and feed the chicks. Males assist with feeding of the chicks. They have complex songs and are good mimics.