The Tui (Prosthemadera novaeseelandiae) is an endemic passerine bird of New Zealand, one of the largest members of the diverse honeyeater family.

The name Tui is from the Maori language and is the formal common name. The English name, Parson Bird, has fallen into disuse but came about because at first glance the Tui appears completely black except for a small tuft of white feathers at its neck and a small white wing patch, causing it to resemble a parson in religious attire.

On closer inspection, it can be seen from the photo that Tui have faded browner patches on the back and flanks, a multicoloured iridescent sheen which varies with the angle from which the light strikes them, and a dusting of small, white-shafted feathers on the back and sides of the neck that produce a lacy collar.

Tui are found through much of New Zealand, particularly the North Island, the west and south coasts of the South Island, Stewart Island and the Chatham Islands. Populations have declined considerably since European settlement, mainly because of habitat destruction but also from hunting and imported mammalian predators.

Nonetheless, the species is considered secure and has made recoveries in some areas, particularly after removal of livestock has allowed vegetation to recover. Predation by introduced species remains a threat, particularly stoats, the Common Myna (which competes with Tui for food and sometimes takes eggs), and rats.

Tuis prefer broadleaf forests below 1500 metres but will tolerate quite small remnant patches, regrowth, exotic plantations and well-vegetated suburbs. They are usually seen singly, in pairs, or in small family groups, but will congregate in large numbers at suitable food sources, often in company with Silvereyes, Bellbirds (another New Zealand honeyeater), or Kereru (native New Zealand pigeon).

Nectar is the primary diet item but fruit and insects are frequently taken, and pollen and seeds more occasionally. Particularly popular is the New Zealand flax, whose nectar sometimes ferments, resulting in the Tuis flying in a fashion that suggests that they might be drunk.

Tui are considered to be very intelligent, much like parrots. They also resemble parrots in their ability to imitate human speech, and are known for their noisy, unusual call, different for each individual, which combines bell-like notes with clicks, cackles and wheezing sounds.